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..