This election cycle has stoked American xenophobia. Building walls, keeping foreigners out, and monitoring our own immigrant populations are presented as viable security procedures. Barricading our country is not only bigoted and benighted, but also dangerous. Excluding visitors from “suspect” countries will damage our security by preventing those who would have spoken best of us from finding out what there is to admire here. This is not to say that a proliferation of student visas issued at the behest of Iowa State or UCLA will solve the world’s problems, but only that it’s hard to love a place you’ve never visited.