SubZero
Joined 15 years ago
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Pair this with a large influx of immigrants from other countries, and it scares people even more. The constant threat of terrorism has caused people to live in fear, and governments to react accordingly.
All in all, those are some major parts of the puzzle.
In another comment section (Reddit, I believe) there was anecdotal evidence that visitors from Bulgaria, Croatia, Cyprus, Poland and Romania regularly outstayed their visas and were notorious for violating a tourist visa, hence the additional checks the US wanted to put them through.