Answer:
C. Truman doc
Step-by-step explanation:
The Cold War was a non-traditional war that consisted of high tensions between the USA and the USSR.
Korea
After WWII, China and the USA agreed to work together in order to clear out Japanese troops from Korea. China agreed to bring troops into northern Korea and the USA was in charge of southern Korea. The original plan was to free Korea from Japanese control and then remove all foreign troops.
However, during this time China was taken over by a Communist government. Chinese troops and advisors told the leaders of northern Korea to also become Communists, and they did. Still, southern Korea was under the democratic rule and had strong relationships with American leaders. So, they refused to accept Communist rule. Communist leaders in the north invaded the south. Thus, the Korean War began and North and South Korea were officially split.
Truman Doctrine
America strongly supported both capitalism and democracy, and Communism conflicted with these ideas. Additionally, many Americans supported the idea of "Domino Theory". Domino Theory suggested that if communism spreads to a new country, then other countries in that region will also fall to Communism. So, America started a containment plan. The idea behind containment was to stop the spread of Communism.
In order to support containment, Truman created the Truman Doctrine. This doctrine stated that the US should give support to any countries facing Communist insurrection. By this principle, the USA agreed to send aid and troops to Korea in order to support the free people of South Korea.