Which statement best describes the united states' changing role in the world during the twentieth century? a: it changed from a great power into an isolationist nation, much like japan. b: it was vastly richer, larger, and more powerful than it had been one hundred years before. c: its losses during the war of 1812 substantially weakened its power for the next hundred years. d: its strict economic controls resulted in a widespread return to mercantilism. e: it became a military superpower in the world but lacked a strong economy..