This project is filed under Mapping American Social Movements, a project of the Civil Rights and Labor History Consortium at University of Washington. Here is the intro, copied from the project web page, by Amanda Miller:

The May 1970 antiwar strikes became one of the largest coordinated sequences of disruptive protests in American history, with walkouts spreading across more than 883 campuses involving more than a million students. On April 30, 1970, President Nixon announced that American forces had invaded Cambodia in an effort to disrupt North Vietnamese supply lines. This secret widening of the Vietnam conflict drew immediate condemnation around the the world and fierce protests from antiwar activists in the United States, especially on college campuses. Five days days later, Ohio National Guard troops fired into a crowd protesting at Kent State University, killing four, wounding nine. Calls for a nationwide student strike escalated and in the days that followed students at hundreds of campuses boycotted classes. Mass protests, marches, building takeovers, attacks on ROTC facilties, clashes with police were reported at many. Authorities suspended classes on 97 campuses and 20 remained closed for the remainder of school year. [continue introductory essay on project website]

Here we map and list 883 campuses where protest activities were reported. This is a partial list of actions, derived mostly from reports compiled by the National Strike Information Center, a student group at Brandeis University. The maps are hosted by Tableau Public and may take a few seconds to respond. If slow, refresh the page. Here are other New Left and Antiwar Movement maps.