Not sure of what the costs for college are anymore- I graduated in 1977, but my son's daughter is a 4th year student in a state school and isn't deeply in debt.
It really depends on the school and the state it is located in...
On the low end, there are schools with annual tuition rates around $7K.. generally speaking you can double that number once you factor in housing, books, meal plans, parking, and all of the other stuff they hit you up for.. so think in terms of $12-$15K annual..
On the high end.. there are schools that no shit are charging $70-$75K per year for just tuition alone (Harvey Mudd, Univ of Chicago, and Columbia are all around $75K.. Most of the Ivy League and a handful of other schools are north of the $70K per year mark (Northwestern, Sara Lawrence, SMU, USC, etc)..
That said.. many states now have state level, statewide scholarship programs for students that graduate high school with reasonable GPA's that can offset these costs quite a bit.. and the schools themselves have fairly robust departments that specialize in getting students grants and other forms of financial aid..
For example.. Harvey Mudd.. one of, if not the most expensive schools in the US... annual tuition is more than $75K.. but the average student pays about $33K a year after grants, scholarships, and other aid is provided...
Still an insane amount of money when you figure the cost of an undergrad degree from Oxford or Cambridge in the UK is about $12K a year (two of the finest universities in the world)..
But that is the difference in the US university system and the systems you find in other countries..
Elsewhere the priority is education.. in the US the priority is "experience"... Experiences cost money... and now that universities cant provide those experiences.. they cant compete... and kids are dropping out like flies and pursuing other options..