If you mean WW2, its because America wanted isolationism and didn't want to fight in the war. They were able to stay out of it for as long as they did because they didn't take sides.
Franklin D. Roosevelt, in his speech "Four Freedoms", in 1941, mentioned some things that can be considered inconsistent with the US policy, because when he says: 1<em>) "The need of the moment....is to meet this foreign peril. For </em><em>our domestic problems are now a part of the great emergency</em><em>" and 2) "Just as our national policy in internal affairs has been </em><em>based upon a decent respect for the rights and the dignity ofall our fellow men..." </em>are not consistent with all the discriminatory practices blacks faced at that time.
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Except for few monarchs in Asia and Africa, most present-day monarchs only have symbolic power. They are rather symbols of their nations, icons of national unity and identity (Spain, Britain, Sweden, the Netherlands), or special representatives of historical continuity (Japan). Real power often lies in parliaments or prime ministers in those countries.
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