What did the U.S. do after the North Korea attack to South Korea?

After the North Korea attack on South Korea in 1950, the U.S. responded by sending military aid and troops to the war-torn country. This was done in order to support South Korea in its struggle against communist North Korea, and also to contain a possible threat of further expansion by North Korea. This initial intervention was led by General Douglas MacArthur, and involved extensive air power, naval vessels, and ground forces, including a significant number of U.S. soldiers. The U.S. eventually led a UN coalition of forces in order to fight the North Koreans and eventually pushed them back across the 38th parallel. The U.S. involvement in the Korean War lasted for three years until an armistice agreement was signed and a ceasefire was declared in 1953.