Chapter Notes: The Twentieth Century

Table of Contents
1. America Enters the World Stage
2. The Progressive Era
3. World War I and Its Aftermath
4. The Roaring Twenties
5. The Great Depression
6. The New Deal
7. World War II
8. The Cold War
9. The Civil Rights Movement
10. Social and Cultural Changes
11. Economic and Technological Changes
12. The End of the Cold War
13. America at Century's End
View more

The twentieth century was a period of tremendous change in the United States. From 1900 to 2000, America transformed from a developing nation into a global superpower. The country experienced two world wars, a devastating economic depression, major social movements, remarkable technological advances, and significant shifts in government policies. These hundred years reshaped nearly every aspect of American life, from how people worked and communicated to who could vote and participate fully in democracy.

America Enters the World Stage

At the start of the twentieth century, the United States began looking beyond its own borders. After winning the Spanish-American War in 1898, America acquired territories including Puerto Rico, Guam, and the Philippines. This marked a shift from focusing mainly on westward expansion within North America to becoming involved in international affairs. Imperialism-the policy of extending a nation's power by acquiring territories or controlling other nations-became part of American foreign policy, though many Americans debated whether this matched the nation's democratic values.

President Theodore Roosevelt (1901-1909) believed America should be an active world power. He famously said the United States should "speak softly and carry a big stick," meaning the nation should negotiate peacefully but maintain strong military forces. Roosevelt oversaw construction of the Panama Canal, completed in 1914, which connected the Atlantic and Pacific Oceans and dramatically reduced shipping time between America's coasts. This engineering marvel demonstrated American technological capability and expanded the nation's strategic power.

The Progressive Era

From approximately 1890 to 1920, the Progressive Era brought sweeping reforms aimed at solving problems created by industrialization, urbanization, and political corruption. Progressives believed that government should actively work to improve society, much like a doctor diagnosing and treating an illness. These reformers came from different backgrounds but shared concerns about the growing power of big businesses, unsafe working conditions, political corruption, and inequality.

Key Progressive Reforms

• Workplace safety laws: After tragic events like the 1911 Triangle Shirtwaist Factory fire, which killed 146 workers trapped in a burning building, states passed laws requiring fire exits, sprinkler systems, and safer working conditions
• Food and drug safety: The Pure Food and Drug Act (1906) required truthful labeling after journalists exposed dangerous substances in food and medicine
• Trust-busting: The government broke up monopolies-companies that controlled entire industries-to restore competition and fair prices
• Political reforms: Direct election of senators, secret ballots, and women's suffrage expanded democracy
• Conservation: President Roosevelt established national parks and forests to protect natural resources for future generations

The Progressive movement achieved one of its greatest victories in 1920 when the Nineteenth Amendment granted women the right to vote. Suffragists like Susan B. Anthony, Elizabeth Cady Stanton, and later Alice Paul had fought for decades to achieve this fundamental democratic right. However, Progressive Era reforms often excluded or discriminated against African Americans, immigrants, and other minorities, revealing limitations in the movement's vision of equality.

World War I and Its Aftermath

When World War I began in Europe in 1914, most Americans wanted to remain neutral. President Woodrow Wilson campaigned for re-election in 1916 with the slogan "He kept us out of war." However, several factors eventually drew the United States into the conflict in April 1917:

1. German submarines sank American ships, including the passenger liner Lusitania in 1915, killing 128 Americans
2. Germany tried to convince Mexico to attack the United States (the Zimmermann Telegram)
3. American economic ties to Britain and France created pressure to protect those investments
4. Wilson believed America could help create a more democratic and peaceful world order

American entry into World War I tipped the balance in favor of the Allied Powers (Britain, France, and Russia). More than four million Americans served in the military, with over 116,000 dying in combat. The war ended on November 11, 1918, with Germany's defeat.

President Wilson proposed a peace plan called the Fourteen Points, which included creating a League of Nations to prevent future wars. Wilson stated his vision clearly:

"What we seek is the reign of law, based upon the consent of the governed and sustained by the organized opinion of mankind."

This quote expressed Wilson's belief that international cooperation and democratic principles could create lasting peace. However, the U.S. Senate refused to join the League of Nations, fearing it would drag America into future European conflicts. This decision reflected a return to isolationism-the policy of staying out of foreign affairs and alliances.

The Roaring Twenties

The 1920s brought dramatic cultural and economic changes. The decade earned the nickname "Roaring Twenties" because of widespread prosperity, new forms of entertainment, and shifting social attitudes. Several developments transformed daily life:

Economic Growth and Consumerism

American industries boomed during the 1920s. Mass production techniques, pioneered by Henry Ford's automobile assembly lines, made cars affordable for middle-class families. By 1929, one in five Americans owned an automobile. This transformed where people lived, worked, and spent leisure time. New products like radios, refrigerators, and vacuum cleaners changed home life, while advertising convinced Americans to buy on credit-purchasing now and paying later in installments.

Cultural Changes

The 1920s witnessed a cultural revolution, especially in cities. Young women called flappers challenged traditional expectations by wearing shorter skirts, cutting their hair, and participating in social activities previously considered improper. Jazz music, created primarily by African American musicians like Louis Armstrong and Duke Ellington, became wildly popular. The Harlem Renaissance in New York City produced an explosion of African American literature, art, and music that challenged racist stereotypes and celebrated Black culture.

Prohibition

The Eighteenth Amendment (1919) banned the manufacture, sale, and transportation of alcohol, launching the Prohibition era. Reformers believed prohibiting alcohol would reduce crime, poverty, and family problems. Instead, Prohibition created enormous illegal businesses. Gangsters like Al Capone earned millions selling illegal alcohol in secret bars called speakeasies. The government struggled to enforce the unpopular law, which was finally repealed by the Twenty-First Amendment in 1933.

The Great Depression

The prosperity of the 1920s ended abruptly on October 29, 1929-"Black Tuesday"-when the stock market crashed. Share prices collapsed, wiping out millions of dollars in wealth. This event triggered the Great Depression, the worst economic crisis in American history.

Causes of the Depression

Impact on Americans

The Depression affected nearly everyone. By 1933, approximately 25% of workers were unemployed-unable to find jobs despite wanting to work. Families who once lived comfortably found themselves standing in bread lines for free food, much like people today might line up for emergency supplies after a natural disaster. Many lost their homes and lived in makeshift shanytowns nicknamed "Hoovervilles" after President Herbert Hoover, whom many blamed for not doing enough to help.

Farmers faced particularly severe hardships. Agricultural prices collapsed, making it impossible to repay loans or mortgages. In the Great Plains, severe drought combined with poor farming practices created the Dust Bowl. Massive dust storms buried fields and homes, forcing hundreds of thousands of families to abandon their farms and migrate west, especially to California, seeking work.

The New Deal

When Franklin D. Roosevelt became president in March 1933, he promised a "New Deal" for Americans. In his inaugural address, he famously declared:

"The only thing we have to fear is fear itself-nameless, unreasoning, unjustified terror which paralyzes needed efforts to convert retreat into advance."

Roosevelt meant that Americans shouldn't let fear prevent them from taking bold action to solve the Depression. His administration launched dozens of programs to provide relief, recovery, and reform.

Major New Deal Programs

• Civilian Conservation Corps (CCC): Employed young men to plant trees, build parks, and complete conservation projects
• Works Progress Administration (WPA): Created jobs building roads, bridges, schools, and other public facilities
• Social Security Act (1935): Established pensions for elderly Americans and unemployment insurance-programs still vital today
• Federal Deposit Insurance Corporation (FDIC): Insured bank deposits so people wouldn't lose savings if banks failed
• Tennessee Valley Authority (TVA): Built dams to provide electricity and prevent flooding in seven states
• National Labor Relations Act: Protected workers' rights to form unions and bargain collectively with employers

The New Deal fundamentally changed the relationship between the federal government and citizens. For the first time, many Americans expected the government to actively manage the economy and provide a social safety net. However, the New Deal faced criticism from both sides: some argued it gave government too much power, while others claimed it didn't go far enough to help those in need. Additionally, many New Deal programs excluded or discriminated against African Americans and other minorities, limiting their benefits.

World War II

World War II began in Europe in September 1939 when Germany, led by dictator Adolf Hitler, invaded Poland. Initially, most Americans wanted to avoid another European war. However, events gradually changed public opinion:

1. Nazi Germany conquered most of Western Europe by 1940, threatening Britain
2. Japan pursued aggressive expansion in Asia and the Pacific
3. The United States provided military supplies to Britain and other nations fighting the Axis Powers (Germany, Italy, and Japan)

On December 7, 1941, Japan launched a surprise attack on the U.S. naval base at Pearl Harbor, Hawaii, killing over 2,400 Americans and sinking or damaging numerous ships. The next day, President Roosevelt asked Congress to declare war, calling December 7 "a date which will live in infamy." The United States entered World War II, joining the Allied Powers (primarily Britain, the Soviet Union, and China).

The Home Front

World War II transformed American society. Factories converted to war production, manufacturing tanks, planes, ships, and weapons. The economy boomed, finally ending the Great Depression. Unemployment virtually disappeared as more than 16 million Americans served in the military and millions more worked in defense industries.

Women took jobs previously reserved for men, working in factories, shipyards, and other essential industries. Rosie the Riveter became a cultural icon representing women's contributions to the war effort. African Americans also served in the military and worked in defense industries, though they faced continued segregation and discrimination. The Double V Campaign called for victory against fascism abroad and victory against racism at home.

However, the war also brought injustice. After Pearl Harbor, the U.S. government forced approximately 120,000 Japanese Americans-most of them U.S. citizens-into internment camps. Families lost homes, businesses, and freedom based solely on their ancestry, not on any evidence of disloyalty. This represents one of the darkest chapters in twentieth-century American history. In 1988, the government officially apologized and provided compensation to survivors.

Winning the War

The war raged on multiple fronts. In Europe, Allied forces invaded Nazi-occupied France on D-Day (June 6, 1944), beginning the liberation of Western Europe. Soviet forces advanced from the east. Germany surrendered on May 8, 1945, after Hitler's suicide.

In the Pacific, American forces fought island-by-island battles against fierce Japanese resistance. To end the war without invading Japan-which military leaders feared would cost hundreds of thousands of American lives-President Harry S. Truman authorized dropping atomic bombs on the Japanese cities of Hiroshima (August 6, 1945) and Nagasaki (August 9, 1945). These weapons, developed in secret through the Manhattan Project, killed over 200,000 people, mostly civilians. Japan surrendered on August 15, 1945, ending World War II.

The decision to use atomic weapons remains controversial. Supporters argue it saved lives by ending the war quickly, while critics contend the devastation was morally unjustifiable and that Japan might have surrendered soon anyway. This debate illustrates how historians can interpret the same events differently based on which factors they emphasize.

The Cold War

After World War II, tension developed between the United States and the Soviet Union, former allies who now represented opposing systems. The Cold War-called "cold" because the superpowers never fought each other directly-dominated international relations from approximately 1947 to 1991.

Competing Systems

The Cold War influenced American domestic and foreign policy for decades. The Truman Doctrine (1947) promised U.S. support to countries resisting communism. The Marshall Plan provided billions of dollars to rebuild Western Europe, both to promote recovery and to prevent communist movements from gaining support. Much like vaccination prevents disease from spreading, American leaders believed economic aid would prevent communism from spreading to vulnerable nations.

Korea and Vietnam

The Cold War led to military conflicts in Asia. When communist North Korea invaded South Korea in 1950, the United States sent troops to defend South Korea. The Korean War (1950-1953) ended in stalemate, with Korea remaining divided.

American involvement in Vietnam escalated during the 1960s. The U.S. government supported South Vietnam against communist North Vietnam, fearing that if Vietnam fell to communism, neighboring countries would follow like dominoes toppling each other. By 1968, over 500,000 American troops served in Vietnam. However, the war became increasingly unpopular as casualties mounted, television brought battlefield images into American homes, and many questioned whether the war could be won or whether it was morally justified. The United States withdrew in 1973, and North Vietnam conquered South Vietnam in 1975.

The Civil Rights Movement

Despite fighting for freedom abroad during World War II, African Americans returned home to continued segregation, discrimination, and denial of voting rights, especially in the South. The Civil Rights Movement fought to achieve equality and justice through protests, legal challenges, and political action.

Key Events and Achievements

The movement gained momentum when the Supreme Court ruled in Brown v. Board of Education (1954) that school segregation violated the Constitution. Chief Justice Earl Warren wrote that separate educational facilities were "inherently unequal," overturning the "separate but equal" doctrine that had justified segregation since 1896.

In 1955, Rosa Parks refused to give up her bus seat to a white passenger in Montgomery, Alabama, violating segregation laws. Her arrest sparked the Montgomery Bus Boycott, during which African Americans refused to ride city buses for over a year. A young minister named Martin Luther King Jr. emerged as a leader, advocating nonviolent resistance inspired by Mahatma Gandhi's methods.

Throughout the late 1950s and 1960s, activists organized protests across the South:

• Sit-ins: Students peacefully sat at segregated lunch counters, refusing to leave until served
• Freedom Rides: Activists rode interstate buses to challenge segregation in transportation
• Freedom Summer (1964): Volunteers registered African American voters in Mississippi despite violence and intimidation
• Selma to Montgomery marches (1965): Protesters demanding voting rights were attacked by police on "Bloody Sunday," shocking the nation

In 1963, King delivered his famous "I Have a Dream" speech during the March on Washington, attended by over 250,000 people. He envisioned an America where people would "not be judged by the color of their skin but by the content of their character." This powerful message appealed to American ideals of equality and justice.

Legislative Victories

The movement achieved major legislative victories. The Civil Rights Act of 1964 banned discrimination based on race, color, religion, sex, or national origin in employment and public accommodations like restaurants and hotels. The Voting Rights Act of 1965 prohibited literacy tests and other tactics used to prevent African Americans from voting and authorized federal oversight of elections in areas with histories of discrimination.

However, progress came at great cost. Activists faced violence, imprisonment, and murder. King himself was assassinated in 1968. Moreover, legal equality didn't immediately translate to economic opportunity or social acceptance. The struggle for civil rights continued beyond the 1960s and remains ongoing today.

Social and Cultural Changes

The 1960s and 1970s witnessed numerous social movements demanding equality and change. The women's movement fought for equal rights, equal pay, and reproductive freedom. Books like Betty Friedan's The Feminine Mystique (1963) challenged traditional gender roles. In 1972, Congress passed Title IX, banning sex discrimination in education, which dramatically increased opportunities for girls and women in schools and athletics.

Young people questioned traditional authority and values during the counterculture movement. Many opposed the Vietnam War, experimented with alternative lifestyles, and challenged social conventions. The movement produced lasting cultural changes in music, fashion, and attitudes toward authority.

Environmental awareness grew after Rachel Carson's book Silent Spring (1962) revealed how pesticides harmed ecosystems. The first Earth Day in 1970 mobilized millions of Americans, leading to creation of the Environmental Protection Agency and passage of clean air and water laws.

Economic and Technological Changes

The American economy shifted dramatically during the late twentieth century. Manufacturing jobs that had supported middle-class families declined as companies moved factories overseas or automated production. Like a forest changing from pine to oak trees, the economy transitioned from making physical goods to providing services and information. The service sector-jobs in healthcare, education, finance, and technology-grew rapidly.

Technological innovation accelerated. The Space Race between the United States and Soviet Union led to incredible achievements, culminating in American astronauts landing on the moon in 1969. Personal computers, invented in the 1970s and popularized in the 1980s and 1990s, revolutionized work and communication. The Internet, initially developed for military and academic purposes, became publicly available in the 1990s, beginning to transform how people access information, communicate, and conduct business.

The End of the Cold War

During the 1980s, the Soviet Union faced severe economic problems and pressure for reform. Soviet leader Mikhail Gorbachev introduced policies of glasnost (openness) and perestroika (restructuring), hoping to save the communist system. Instead, these reforms unleashed forces that brought dramatic change.

In 1989, communist governments across Eastern Europe collapsed. The Berlin Wall, symbol of Cold War division, was torn down. The Soviet Union itself dissolved in 1991, ending the Cold War. The United States emerged as the world's sole superpower, but also faced new questions about America's role in a changed world.

America at Century's End

The final decade of the twentieth century brought both optimism and new challenges. The economy boomed, driven partly by technology companies. Unemployment fell and the federal budget showed surpluses rather than deficits for the first time in decades.

However, Americans also confronted ongoing issues. Economic inequality increased, with wealth concentrating among the richest Americans while many workers' wages stagnated. Healthcare costs rose dramatically. Political divisions intensified, making compromise increasingly difficult. Acts of terrorism, including the 1995 Oklahoma City bombing and attacks on U.S. embassies in Africa in 1998, foreshadowed challenges the nation would face in the twenty-first century.

As the twentieth century ended, the United States had been transformed. The nation that entered the 1900s as a growing industrial power had become a diverse, technologically advanced superpower with global influence. Americans had fought for civil rights, survived economic depression and world wars, sent people to the moon, and pioneered revolutionary technologies. The century's events-both triumphs and failures-shaped the America we know today and set the stage for challenges and opportunities of the new millennium.