It depends so much on the nature of the engagement. Who's attacking who, here? I mean, right now, the US military is stretched to the limit of what it can do (without conscription) just trying to occupy two small countries in the middle east, and that's with all kinds of allied support.
So could the US conquer the world? Not a chance. Not even North America.
Could the world conquer the US? Only slightly less impossible.
We're not even really sure what a conflict between two major military powers would look like nowadays. It all seems to come down to who has the better missiles and who gets range with them first. For example, it's quite possible that if the entire US Navy was sailing within 100km of the coast of Iran, Iran could sink the entire US Navy (except submarines) without even deploying a single aircraft or boat.
"The worst part about these reviews is they are [subjective]--and their scores often depend on how drunk you got the media at a Street Fighter event." — Mona Hamilton, Capcom Senior VP of Marketing
*Image indefinitely borrowed from BrainBoxLtd without his consent.
