The miracle of modern China was built on global connections, a belief that sending young people, companies and future leaders to soak up the outside world was the route from impoverishment to power. Now, emboldened by its transformation, the country is shunning the influences and ideas that nourished its rise.

The country’s most dominant leader in decades, Xi Jinping, seems intent on redefining China’s relationship with the world, recasting the meeting of minds and cultures as a zero-sum clash.

Education officials are imposing restrictions on English education and requiring that scholars ask permission to attend even virtual international conferences. Regulators have punished Chinese companies for raising money overseas. Xi has exhorted artists to embrace "cultural confidence” by promoting traditional Chinese literature and art, and has warned against imitating Hollywood.