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US...although, it took the War of 1812 where the Brits burned down DC, then a Civil War, then The Spanish-American War, and suddenly overnight we had Puerto Rico, Guam, the Phillipines, and then we had "control" of the Panama Canal, oh and then there was WWI, and then WWII,
so basically after a few hundred yrs, and few Wars, we became something of a player on the world stage.