Sure there's lot's to see in the USA, a great tourist destination. But the almost daily reports of legal visitors being detained and refused entry is a bit off-putting to many people and as Trump is "a bit unpopular" in the rest of the world and also rather unpredictable the USA is seen as not an ideal holiday destination, coupled with almost every country in the world advising LGBTQ not to visit, the USA will lose all of them and almost everybody who is sympathetic to them, which in many countries is the majority.
The USA is not the only place with good places to see, Europe has 100x as many attractions if you have an interest in history, Asia too
There's many things such as National Parks, museums and other venues that aren't going to be changed by politics.
Oh yea? He's already targetting the Smithsonian, environmental programs are being gutted and the National Park Service has already been cut so the parks will be less desirable once the staff reductions cause parts to be closed to visitors as they cannot be staffed safely.
Domestic tourism will plummet too as people find their earnings are not going as far as they used to.
To make things better people, companies and countries need to learn from their mistakes but in America it is drummed into people from infancy that the USA is the best country and everybody is jealous and wants to live there. This is a total lie, no country is "the best country" every country has good and bad points, nobody is jealous of the USA and I've not met anybody in Europe who not already stupidly rich who wants to move to the USA, it's seen as great if you are rich, otherwise not so much.
The point is that before you can learn from your mistakes you have to acknowledge you've made a mistake and people like Trump will never admit to an error so they can never learn. This attitude is destroying America - Learn some bloody humility.
You'll find things a lot easier to book in a few months, the existing full order books are because they were booked last year and couldn't be cancelled without financial loss so I hope you have a nice holiday wherever you go.