(Gengxu March 29), May 4, 1970, more than 3,000 U.S. college students demonstrations to protest the U.S. military invasion of Cambodia. 4, 2011 Kent State University in Ohio

1970, more than 3,000 student demonstrations protesting the U.S. military invasion of Cambodia. Was police repression, many students were injured in the process, four students were shot and killed, including two female students.