In 1970 President Nixon invaded Cambodia to try to prevent infiltration of communist forces from that country into South Vietnam. Protests erupted across the US, especially on university campuses. At which Ohio university campus were 4 students killed at one such protest?

The 1960s saw considerable unrest in the USA. On university campuses and elsewhere a rebellious counterculture of freedom flourished. By no means all of American society took part in this new lifestyle, and the 1970s saw a reaction to the radicalism of the 1960s. By 1980 another period of Republican government of the USA was looming.