WHY TWO? America, China, and the Ways Great-Power Rivalries End: Fifteen rivalries. Seven known endings. One unwritten.

Fourteen great-power rivalries have already passed into history. America and China are the fifteenth pair. Their ending is unwritten. Why does power keep settling into pairs-and why do those pairs so often believe their contest has no precedent? From Athens and Sparta to Rome and Carthage, Britain and Germany, and the United States and the Soviet Union, Why Two? traces seven recognizable historical doors across twenty-five centuries of rivalry. Some pairs provide the clearest examples. Others show a door recurring, changing form, or approaching without fully opening. Alongside those rivalries, one anniversary day unfolds hour by hour as a finished schedule meets conditions it cannot command. The book also traces what power ran on in each age-sanctification, silver, credit, wire, steel, oil, silicon, and, oldest of all, trust. It brings that history into the present through semiconductors, submarine cables, energy routes, reserve currency, Russia's dependence on China, alliances, and Taiwan. This is not a prophecy and not another argument that war is inevitable. It is a memorable framework for seeing the pressures, choices, and possible endings of the rivalry between America and China. History gives forms, not commands.