Want to see how quickly the look and business model of American public universities are changing? Visit a place like Indiana University, says the Associated Press. Five years ago, there were 87 undergraduates from China on its idyllic, All-American campus in Bloomington. This year: 2,224. New figures out Monday show international enrollment at U.S. colleges and universities grew nearly 6 percent last year, driven by a 23-percent increase from China, even as total enrollment was leveling out. But perhaps more revealing is where much of the growth is concentrated: big, public land-grant colleges, notably in the Midwest. The numbers offer a snapshot of the transformation of America’s famous heartland public universities in an era of diminished state support. Of the 25 campuses with the most international students, a dozen have increased international enrollment more than 40 percent in just five years, according to data collected by the Institute of International Education…