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.

The answer is: E. It became a military superpower in the world but lacked a strong economy.

During the 20th century, United states more than 20% of its GDP to be allocated into millitary spending, which make us able to become a millitary superpower and contribute greatly to the victories during the world war I.

There is a downside to this. Large allocation to millitary budget means that there would be less that can be allocated to build things such as infrastructures, loans, government sponsored jobs, etc. Which is why the economy of united states at that era was a little bit lacking.

the awenser wuold be slaves