Is America the Last Empire The World Will Ever Know? -- Tom Engelhardt, Tom Dispatch/Real Clear World
It stretched from the Caspian to the Baltic Sea, from the middle of Europe to the Kurile Islands in the Pacific, from Siberia to Central Asia. Its nuclear arsenal held 45,000 warheads, and its military had five million troops under arms. There had been nothing like it in Eurasia since the Mongols conquered China, took parts of Central Asia and the Iranian plateau, and rode into the Middle East, looting Baghdad. Yet when the Soviet Union collapsed in December 1991, by far the poorer, weaker imperial power disappeared.
And then there was one. There had never been such a moment: a single nation astride the globe without a competitor in sight. There wasn't even a name for such a state (or state of mind). "Superpower" had already been used when there were two of them. "Hyperpower" was tried briefly but didn't stick. "Sole superpower" stood in for a while but didn't satisfy. "Great Power," once the zenith of appellations, was by then a lesser phrase, left over from the centuries when various European nations and Japan were expanding their empires. Some started speaking about a "unipolar" world in which all roads led... well, to Washington.
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My Comment: Who knows what tomorrow will bring .... but there is no doubt in my mind that the U.S. has played an important role on the world stage for the past century.