U.S. defense leaders have allowed China’s military might to grow unchecked while they prattle on about critical race theory and climate change. That increases the risk of war over Taiwan.The Chinese Communist Party is open about its imperial ambitions. Chinese leader Xi Jinping calls explicitly for “the transformation of the global governance system”—which means China in charge of the Asian Pacific and, ultimately, the world. America must act now to stop it. Our economic prosperity, no less than our national security, depends on it. A China that bestrides the Pacific would make today’s supply chain woes look pleasant. A China...