Of course the US doesn't have the manpower to take on the world - it only has what? 4.5% of the entire population of the world?
Conventionally speaking, regardless of projecting power, the US could beat any one nation. It would take a combo of the next 3 largest militaries to beat the US.
There are a lot of factors that play into who would win what:
- Current military budget
- Current military technology
- Economy
- Infrastructure
- Manpower
- Potential manpower
- Availability of irregular guard
Some countries have a better payout on budget/technology than America, but are lacking in other areas. If the US had to go into 'war mode' like they did in WW2, they would absolutely decimate any one nation, or group of smaller nations, if it absolutely came down to it. It would require the EU + another major nation, or a group of 3 major singular nations (China, India, Russia, ect) to outweigh what the US could field in a war.
Back from the dead, I'm afraid.
