The United States asked the UN the remove the North Koreans by force, claiming that their invasion was a violation of peace
USSR could not veto the decision (boycotting); UN sent in troops in support of South Korea (15 UN countries); US comprised of 90% of the UN force
July 1 troops arrived in Korea, soon joined by 15 other nations, although majority were American troops fought under UN commander American General Douglas MacArthur
General MacArthur led the UN forces in an amphibious attack at Inchon (near Seoul) in order to bypass Korean troops & cut them off
Within a month he retook Seoul & drove the North Koreans back to the 38th parallel
Pushed North Koreans as far back as the Yalu River (Korean border w/ China)
US redefined its war aims: Rather than just concentrating on a policy of containment, it decided on a policy of ‘rollback’ meant liberating North Koreans from Communist rule & reuniting Korea
China became concerned for its own security
November 27,1950, a force of 200,000 Chinese joined 150,000 North Koreans & sent the UN troops into a rapid retreat