Public Universities (which usually have names like "University of Florida" or "Idaho State University" are heavily subsidized by direct money from (primarily) state governments. Many "private" universities also get significant direct money from government. In addition, there are federally (and state) funded scholarship programs that give money for school directly to students, and student loans have their interest paid while the student is in school by the federal government.

I don't know how it compares to other countries, but there is a lot of government subsidization.