Reading through this thread quickly multiple issues come to mind.
One issue is that the US is very, very large. Let’s hypothetically suppose that a kid is accepted to 4 schools in 4 different cities. Visiting all four in one trip might be difficult simply because of the distance. This will depend however on which schools you would want to visit and which cities. There are some cities such as Boston that have a lot of universities relatively close together.
Another issue is that the US has a very large number (thousands) of colleges and universities. A large number of these are very good. There is however a rather wide variation and they are not all very good. Which schools you are looking at will matter.
University in the US can be expensive. You should not even start university here unless you are confident that you will be able to afford to finish.
Also, the UK has many very good universities. For a UK citizen or permanent resident, in many cases (not all) they are likely to be less expensive than universities in the US, depending upon how much financial aid you get in the US. One relative has a son who was born in the UK (they were in UK for a few years on business) and they were pleased when he got old enough to attend university because it was going to be less expensive compared to high school. This would generally not be true in the US.