Alot of "slow" people in here, saying stuff like
"Oh yeah, whooo, USA rules, we would kick the Roman's asses!!"
Well done, a tank v a soldier with a sword and shield.
For me, its the Romans, who rose from a single city tribe to controlling 3/4s of the worlds population.
Who have the American millitary been proven against, apart from in WWII, where they were not alone (but did perform superbly)?
(ps, Im English and am very proud of our empire, the greatest the world has ever known and will ever know, but it was alot of well armed soliders with rifles and canons against tribal warriors. The Roman Army, even though they had sophisticated wepons, it was still mainly swords and spears, bows and arrows etc)