What caused America's gradual
abandonment of its policy of neutrality?

Answer

One of the things that caused America's gradual  abandonment of its policy of neutrality was the yearning for revenge on the pearl harbor. The United States abandoned neutrality as events in Europe and Asia brought nations toward war. Wartime strategies reflected on  the political and military goals of alliances, the resources which were on hand, and also the geographical extent of the conflict.

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the governor can not veto a referendum that the voters approve

answer; a farmer who refuses to fight in his country's army;