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isolationism
I believe the term you are looking for is isolation. America had an "isolation policy", which meant that they would stay out of European affairs, for a long period up until their entry into World War One.
'Isolationism'
Neutrility
After WW1, the American foreign policy was very wishful that they could now abolish war permanently or prevent it as much as possible and thus formed the League of Nations. The war "...was feared before it started, popular while it lasted, and hated when it ended." After the war, it became a substantially widespread belief that the venerable institution of war should be abandoned from their affairs. The American people were glad it was over but wanted vindication and to abandon war from all affairs and go back to an "isolationism" nation that way they wouldn't have to worry about other nations and meddling in each others affairs.