Answer:
Isolationists won the upper hand after World War I. Following the mood of public opinion, they were reluctant to keep US deep engagement in world affairs. The Senate refused to ratify the Treaty of Versailles and the treaty of the League of Nations, the cherished brainchild of president W. Wilson. As a result, the absence of the US and the lack of means to enforce its resolutions, the League of Nations was a failure. Isolationist views also made it harder to get the US join the Allied side in the early moments of WWII.
Explanation:
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Political and ethnic rivalries within the countries emerged after independence, due in large part to the poor drawing of the former colonies' borders, which were drawn by their former imperial rulers.
