Superpower has to be a pretty exclusive term so I say no, not before WWII. Otherwise we need a new word for what us and the soviets became after the war.
The war with dying Spain is a good point to begin marking America’s military influence off her own shores.
Before that was recovery from the civil war. The war with cruddy Mexico was expansionistic, did see our troops off our own soil…… War of 1812 we were killing Brits mostly on our own soil…
Yeah, I vote for after WWII. We definately had the resources. Something lime the oosition China is in today though. Plenty of resources but can they get their stuff together and go take over cruddy countries like Iran or Columbia at will like we can?