Neither really paid for all of your tuition - or at least not all of the costs of your education. All the state institutions, pretty much nationwide, I believe, greatly subsidized the cost of running the universities. Tuition, back in your day, was a minority part of the universities' budget. But higher ed became a whipping post starting with the Reagan era and year after year, budgets were slashed. Even during the gravy years of the 90s, budgets were being hammered right and left.
NOW, tuition is the majority contributor to most universities' budgets and the state pays much less. It's not that universities spend more (some do, most don't in inflation adjusted dollars). They have to make up for that lost revenue with increased tuition (and of course "fees"). And no, the football team doesn't make up for that lost revenue. At all.
I'll leave you to speculate on what are the colors of the states have the worse support of their higher (and usually middle and lower) ed.
If I was a little more wllm, I would dig out a graphical for my ex-university. It is pretty stunning, and we were the leader in the Walmartization of higher ed. For years, we undercut tuition by cutting expenditures (faculty, majors, maintenance, anything but the football and basketball programs), to the point it was cheaper to be an out of state student at ISU than it was to be in state at NE, MN, IL, MO, (our surrounding states) and a host of others across the nation. Our enrollment shot up 50% in just a couple of years. But we could not sustain that.