The growth of the secondary sector spread its influence during the Industrial Revolution in the 19th Century.

The Industrial Revolution was a period of major industrialization that took place from the 18th to the 19th century. It was characterized by the transition from an agrarian economy to one dominated by machine manufacturing and the growth of the secondary sector. The secondary sector refers to the manufacturing and construction industries, which produce finished goods from raw materials.

During the Industrial Revolution, there were significant advancements in technology, transportation, and production methods. These advancements led to the growth and expansion of the secondary sector, driving economic and social changes in society.

Key Points:
1. Technological Advancements: The Industrial Revolution saw the development and adoption of new technologies such as steam power, mechanization, and the use of iron and steel. These technologies revolutionized production processes, increasing efficiency and output in the secondary sector.

2. Factory System: The introduction of the factory system played a crucial role in the growth of the secondary sector. Factories centralized production, bringing together large numbers of workers and machines under one roof. This allowed for mass production on a scale never seen before.

3. Urbanization: The growth of the secondary sector led to a rapid increase in urbanization. Workers migrated from rural areas to cities in search of employment opportunities in factories and industries. This influx of people into cities fueled the growth of urban areas and created a demand for goods and services.

4. Division of Labor: The Industrial Revolution also brought about the division of labor, where tasks were broken down into specialized roles. This division increased productivity and allowed for the efficient production of goods.

5. Expansion of Markets: With the growth of the secondary sector, there was an increased production of goods that needed to be sold. This led to the expansion of markets both domestically and internationally. Improved transportation, such as the development of railroads and steamships, facilitated the movement of goods across long distances.

6. Social and Economic Changes: The growth of the secondary sector had a profound impact on society and the economy. It led to the rise of the middle class, as factory owners and industrialists amassed wealth. It also resulted in the working class, who labored in factories under harsh conditions. The Industrial Revolution brought about significant changes in social structures, living conditions, and working conditions.

In conclusion, the growth of the secondary sector during the Industrial Revolution in the 19th century was a result of technological advancements, the factory system, urbanization, the division of labor, and the expansion of markets. These factors transformed society and the economy, shaping the modern world as we know it.