1968    Vietnam War: The execution of Viet Cong officer Nguyen Van Lem by South Vietnamese National Police Chief Nguyen Ngoc Loan is videotaped and photographed by Eddie Adams. This image helped build opposition to the Vietnam War.

1969    Vietnam War: Massive antiwar demonstrations occur in many U.S. cities.

1970    The Hard Hat riot occurs in the Wall Street area of New York City as blue-collar construction workers clash with demonstrators protesting the Vietnam War.

1972    Vietnam War: Increased American bombing in Vietnam prompts anti-war protests in Los Angeles, New York City, and San Francisco.