Question

what country did the united states act as an unofficial ally with only 15 years after the revolutionary war

Answer 1

Great Britain.

Although no official declaration of war had been made, the US acted as an unofficial ally of Great Britain.

Answer 2

Great Britain

Although no official declaration of war had been made, the United States clearly acted as an unofficial ally of Great Britain. Only 15 years since the end of the Revolutionary War, a dramatic transition in American international alliances had occurred.