In the 20th century, some student protests that have been impactful include:
In 1970, the scheduled campus event to protest the U.S. invasion of Cambodia, attracted 3,000 people, who were greeted by 100 armed Ohio National Guardsmen. When tensions rose, the Guardsmen opened fire, killing 4 students and wounding 9. This event contributed to the passage of the War Powers act (1973), which limited the amendment that lowered the voting age from 21 to 18.