After the Korean War, South Korea received economic assistance from the United States of America (USA). This assistance played a crucial role in the post-war reconstruction and economic development of South Korea.

1. Context: The Korean War
The Korean War took place from 1950 to 1953, resulting in significant destruction and loss of life on the Korean Peninsula. The war began when North Korea, supported by the Soviet Union and China, invaded South Korea. The United Nations (UN), led by the United States, intervened to support South Korea.

2. The Role of the United States
The United States played a significant role in supporting South Korea during and after the war. The US commitment to South Korea was driven by its broader Cold War policy of containing communism and preventing the spread of Soviet influence in the region. The US saw South Korea as a strategic ally and provided both military and economic assistance.

3. Economic Assistance
After the war, South Korea was devastated, with its infrastructure, industries, and agriculture in ruins. The economic assistance provided by the United States was critical in helping South Korea rebuild and develop its economy. The assistance took the form of grants, loans, and investment in various sectors.

4. The Economic Impact
The economic assistance from the United States played a vital role in South Korea's transformation from a war-torn country to an industrial powerhouse. It helped kickstart the process of modernization and industrialization in South Korea, paving the way for its remarkable economic growth in the following decades.

5. The Korean Economic Miracle
The economic assistance, coupled with South Korea's own efforts, led to what is often referred to as the "Korean Economic Miracle." The country experienced rapid industrialization, export-led growth, and improvements in living standards. Key sectors such as manufacturing, electronics, and automobiles flourished, turning South Korea into a global economic powerhouse.

Conclusion
In conclusion, after the Korean War, South Korea received economic assistance primarily from the United States of America. This assistance played a crucial role in the post-war reconstruction and economic development of South Korea, leading to its transformation into a thriving economy.