https://phys.org/news/2018-10-space-industry-scrambling-workersbut-foreigners.html

There was one snag, though: Shirshekar grew up at what for him was the unlucky side of Lake Ontario, in Toronto, an hour drive from the U.S. border. That's about the same distance as downtown Orlando from Kennedy Space Center.

But that distance is important when it comes to the stringent U.S. regulations that govern the space industry. It's the roadblock in front of Shirshekar and other international students who come to the country to study space, only to find that they'll be hard-pressed to secure jobs when they graduate.