The 21st-century romance between America's universities and China continues to blossom, with New York University opening a Shanghai campus last month and Duke to follow next year. Nearly 100 U.S. campuses host "Confucius Institutes" funded by the Chinese government, and President Obama has set a goal for next year of seeing 100,000 American students studying in the Middle Kingdom. Meanwhile, Peking University last week purged economics professor Xia Yeliang, an outspoken liberal, with hardly a peep of protest from American academics.

"During...