Expanding Horizons. American Foreign PolicyBefore the Civil War, the U.S. practiced isolationism or noninvolvement in world affairsAfter the Civil War, the U.S. changed it\'s policy to expansionism or a belief in expanding the nation\'s boundaries . Imperialism. The late 1800s and early 1900s were called an age of imperialism.Imperialism can be described as a nation\'s policy of increasing its power by gaining political, economic, or territorial control of other areas.The U.S. became interested9440
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