A website turned up nothing relevant so I turn to you

. College football is massive in the US, it was clear when I went over there, I see it talked about on here too. They sell t-shirts & merchandise in towns, it's in newspapers, it's on ESPN (I think?), people have it on their cars etc.
I'm wondering how it
GOT to be so well, big. In the UK we (sadly) have nothing comparable not even close. The US college football seems to involve great stadiums, national tournaments etc. I don't know too much about it. Is it so successful because of major investment in the game? From who?? Has this always been the case? Or is it popular because of elements like that seen in
other sports? And the schools that give football scholarships is that because they get people to come to their games if they have good players (and thus win things) which means more money for the school like an investment?
In the UK there each university has a ("football") soccer club which may compete in the BUSA competitions (British Universities something) but they
certainly aren't on TV (or even in a paper outside of a student union one) and it isn't as if the community at large or beyond watch it.
I'm interested to find out about the whole thing - it's such a major thing in the U.S and we have nothing similar really.