America has twice as many aircraft carriers as the rest of humanity combined, and America's aircraft carriers are substantially larger than almost all the other's aircraft carriers. The Navy likes to call the big Nimitz class carriers "4.5 acres of sovereign and mobile American territory" -- all two dozen American carriers of all classes add up to about 75 acres of deck space. Deckspace is probably a good measure of combat power. The rest of the world's carriers have about 15 acres of deck space, one fifth that of America's.
From here via News Troll.