[Taniwha]

Everyone has heard the horror stories of people who accidentally run foul of US immigration - one big problem is that the US is one of the few countries without exit procedures, no exit stamp in your passport means no way to prove what date you left - if the US authorities screw up collecting that exit info from the airline you end up in the pokey next time you visit.

Also some countries are now issuing travel warnings about the US because of the mass shootings, especially those aimed at visitors.

[Taniwha]

For example (directly from govt travel websites):

NZ - "Exercise increased caution in the United States due to the threat of terrorism." ..."There is a heightened threat of terrorism in the United States and terrorists remain likely to try to carry out attacks. A number of politically motivated attacks have occurred in recent years, causing multiple deaths and injuries."

Australia - "The United States has more violent crime than Australia, although it rarely involves tourists. Shootings, including mass shootings, can occur in public places"

UK - "Terrorists are very likely to try to carry out attacks in the USA. Attacks could be indiscriminate, including in places visited by foreigners. You should monitor media reports and remain vigilant at all times."

Here's a more general survey of such travel warnings https://edition.cnn.com/2019/08/07/world/us-travel-advisorie...