I still fail to understand why in US the university is so expensive, compared to 99% of universities in Europe. Not even private universities in Europe are so

I still fail to understand why in US the university is so expensive, compared to 99% of universities in Europe. Not even private universities in Europe are so expensive like there, plus there are countries where university is free (e.g. Germany). Is the American Dream just the one who wants their kids don't go to university because it's so much expensive? The boomer generation has really broken it. Imagine now that millennials could not send their kids to colleges because of the high tuition fee, connected to low salaries. It's a system that has its destiny doomed and that a day will collapse badly