From The Collapse of the American Empire: “All empires collapse eventually: Akkad, Sumeria, Babylonia, Ninevah, Assyria, Persia, Macedonia, Greece, Carthage, Rome, Mali, Songhai, Mongonl, Tokugawaw, Gupta, Khmer, Hapbsburg, Inca, Aztec, Spanish, Dutch, Ottoman, Austrian, French, British, Soviet, you name them, they all fell, and most within a few hundred years. The reasons are not really complex.”