At the end of the American Civil War, the U.S.A. had the largest standing army and navy in the world. It did not take Canada or Mexico or eject the European colonialists out of the Western Hemisphere. At the starts of WWI and WWII, the U.S.A. had an inconsiderable army. In the end, the USA's entry proved to be the turning points of the wars. (This is not to denigrate the valiant and victorious efforts of the Allies.) Admiral Yamamoto(?), at the time of Pearl Harbor, said that he feared that the Japanese had awakened a sleeping giant. They did - to their regret. Field Marshall Rommel said that so long as the US had a foothold in Africa, the Axis didn't stand a chance of winning WWII. Never underestimate the power of the American nation and its people.
The nations you mentioned, as presently constituted, could not conquer each other because in the end, after the A-bombing, one nation would have to occupy the other with foot soldiers.
As far as that Iraq idiocy is concerned, it was provoked, started and continues because of greedy and exceptionally stupid people and their lackeys.
Culturally, (for better or worse), the USA has more influence on other nations and peoples, than Rome had in its time. Looked at a TV recently? Used a computer? Had a Coke or Big Mac? Benefited from American outsourcing?
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As for you Tattle Tale :wub: , stay where you are. We don't need another 'bedroom events' Tell All. Who cares anyway? But eat your heart out - in Manchester!.