Answer: The answer is the Kent State University Protests.
Step-by-step explanation:
The Ohio National Guard were deployed during the Kent State University protests that was an anti-war movement. There were a total of 4 students killed during the protests. Nine other students were injured during this same time. Since it was a mass protest, hundreds of students were present. The National Guard fired an estimated 67 rounds into the crowds. This happened on May 4, 1970. The students were on the grounds protesting the presidents' invasion of Cambodia.