Question

Description Acceptable. Over 400 construction workers clashed with advocates of this cause in the Hard Hat (15[1])Riot. Abbie Hoffman attempted to (15[1])levitate the Pentagon while leading 50,000 people during a march for this cause, (15[1])during which George Harris was photographed handing out flowers. (15[1])Three (15[1])high schoolers in Iowa (15[1])wore (*) black armbands in support (10[2])of this cause, (10[1])leading (10[1])to the case (10[1])Tinker v. Des Moines. The Kent State shootings targeted student advocates of this cause in response to a bombing campaign ordered by Richard Nixon. For 10 points, name this cause that opposed U.S. involvement in a war in Southeast Asia. ■END■

ANSWER: anti-Vietnam War [accept any answers indicating protesting, marching, etc. against American involvement in the Vietnam War; prompt on anti-war]
<History - American History>
= Average correct buzz position