Well the US only got what it asked for!
It has introduced so-called securitysystems that are over the top - have greatly reduced civil liberties. A TSA
service that does it outmost to intimidate everyone - and have elected a mad Texan as president - I think they should count themselves lucky that it only a 30% drop!
I know of no-one who would go to the US at present. Previously a lot of friends would go regularly.
I can only expect the tourismfigure to continue to drop.