The policy of the US Government at the onset of both world wars was Isolationism
An Iron Curtain
Growing conflicts in European and Asian countries.
Five things that occurred that led America out of isolationism were the Boxer Rebellion, the Open Door Policy, the Spanish-American War, Japanese-Russian settlement, and the Algecircas Conference.
Yes, the Chinese practiced a policy of isolationism.
Yes, the Chinese practiced a policy of isolationism in the Golden Age.
How did the geography of the United States change after the end of its policy of isolationism.
How did the US go a isolationism foreign policy to a political and military involvement?