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.
Isolationism
yes
Isolationism is a policy of not being involved in world affairs. This means a country does not bother itself with worrying about the welfare of other countries.
Good Neighbor Policy
The U.S. policy of not being involved in world affairs.
Internationalism
The policy of staying out of foreign affairs, known as isolationism, is when a country chooses not to get involved in the political or military affairs of other nations. This policy was followed by the United States during periods of its history, such as before World War I and after World War II. The goal is to focus on domestic issues and avoid being drawn into conflicts that do not directly impact the country's interests.
Isolationism
isolationism
The Cold War.
Isolationism, introduced after World War 1.
internationalism