Nah, we have a talent of buying or trading our way out of wars. We're also not like the British who would continue fighting until they win; We'd continue fighting until it costs us too much.
We were a world power at some point (like, the 17th century), but definitely not because of our military force. We were kinda like the richest people on the planet for a long time, and I prefer pockets full of gold above any stinky-winky colony.