Last year set a record for tourism: 78.6 million foreign travelers came to the United States in 2018. But following that banner year, tourism is now in a slump. Travel in early 2019 is in decline, particularly from Canada, Mexico, China and South Korea. That slowdown started taking place in the second half of last year.

The travel industry is worried about how severe, and long lasting, that decline could be. Experts point to a number of factors working against travelers coming to the United States.