From The Atlantic:
There was a post-superpower quality to this week's Democratic debates. On both nights, foreign policy came up near the end, and the discussion focused mostly on the need to withdraw U.S. troops from Afghanistan, avoid war with Iran and, in Michael Bennet's words, "invest in America again." That's fine, as far as it goes. But there was strikingly little discussion about America's role in upholding a particular balance of power in the world. It was almost as if these Democratic candidates were running for prime minister of Canada.
That's a problem, because the United States is trying to uphold a particular balance of power, even as the economic and military might of China keeps growing. Washington is now pursuing roughly the same grand strategy that ended in war with Japan in 1941: preventing any single Asian power from dominating the Western Pacific. China is challenging that effort. And unless the world's two superpowers accommodate each other, that challenge could lead to war.