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I got a weight off my chest: I turned down an invitation to a math conference in the US and cancelled another I had already accepted. I know I'm probably overreacting, but I was worried about being deported since I've read many news stories about this happening to people with valid visas —including Europeans, so I don't like my chances as a brown Mexican! And even though I know it was unlikely to happen to me (it probably only happens to a small fraction of visitors), I'm happy to stop the nagging worry in the back of my mind. It's a shame: both events would have been great and I would have seen many American friends I don't get to see often.