Many Iranians are not going to American universities this fall. Students from Afghanistan are having trouble getting to campus.

Even students from China and India, the top two senders of international students to the United States, have been flummoxed by a maze of new obstacles the Trump administration has set up to slow or deter people entering the country from abroad.

Between the federal government’s heightened vetting of student visas and President Donald Trump’s travel ban, the number of international students newly enrolled in American universities seems certain to drop — by a lot.

There were about 1 million international students studying in the United States a year ago, according to figures published by the State Department. Data on international student enrollment is not expecte

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