In the early 1900s, many americans wanted to follow a foreign policy known as which favored limited involvement in world affairs.

In the early 1900s, many Americans wanted to follow a foreign policy known as isolationism or neutrality, which favored limited involvement in world affairs. 

The league of nations was found in 1919 to keep peace after world war l.but it failed to prevent world war ll in 1939,so in 1945 the nations of the world set up a new organization,the united state (un).since then, the un has encouraged international cooperation and worked to resolve conflict