1. I would say the Truman doctrine was a response to Chinese communism as President Truman wanted to give European countries economic assistance and resist communism.
2. The Korean War was a result of North Korea invading the south.
3.NASA was founded in response to Soviet technological gains, I believe.
I hope you find these answers useful, I myself have just started this topic
On January 6, 1941 President Franklin D. Roosevelt delivered his eighth State of the Union address, now known as the Four Freedoms speech. The speech was intended to rally the American people against the Axis threat and to shift favor in support of assisting British and Allied troops. Roosevelt's words came at a time of extreme American isolationism; since World War I, many Americans sought to distance themselves from foreign entanglements, including foreign wars. Policies to curb immigration quotas and increase tariffs on imported goods were implemented, and a series of Neutrality Acts passed in the 1930s limited American arms and munitions assistance abroad.
In his address, Roosevelt called for the immediate increase in American arms production, and asked Americans to support his "Lend-Lease" program, which gave Allies cash-free access to US munitions. Most importantly, Roosevelt announced his vision for the world, "a world attainable in our own time and generation," and founded upon four essential human freedoms: freedom of speech and expression, freedom of worship, freedom from want, and freedom from fear.
These freedoms, Roosevelt declared, must triumph everywhere in the world, and act as a basis of a new moral order. "Freedom," Roosevelt declared, "means the supremacy of human rights everywhere."
Well, your answer is going to be A China. This is because China has been a contributor to everything that America has in products and are in dislike of the Americans because of our great debt to them.
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The main cause is poverty and lack of education. They're very poor, so they can't afford school. If the children do go to school, they drop out very young to work and help earn money for the family. That's not the kind of cycle people can break out of easily.
Add to that the civil war from 1960 to 1996 where the military persecuted the native people, killing up to 200,000, and they've had a pretty rough time of it.
I believe your answer is humanism. :)