The call of sanitation workers for fair treatment drew Martin Luther King, Jr. to Memphis.

Whites willing to resort to racist violence found encouragement from high profile figures.

Martin Luther King, Jr launched the Poor People's Campaign in 1968 to fight poverty.

March 1968: Memphis sanitation workers' march in Memphis ends in police violence.

Learning about My Lai changed American opinions about the Vietnam War. Was the price of winning the war a price worth paying?

Lieutenant William Calley's 1971 conviction for crimes committed during the My Lai massacre set off protests in the U.S., with many feeling he was unfairly blamed for Vietnam mistakes.

When should a soldier refuse to follow orders? The 1968 attack of My Lai pushed soldiers and Americans to ask this hard question.

My Lai: In the Vietnam War, military leaders failed to give moral guidance to scared US soldiers.

March 16, 1968, a company of American soldiers entered the village of My Lai, located in Quang Ngai Province in central Vietnam. By the end of the day, they had shot and killed between 300 and 507 unarmed and unresisting men, women and children. What drove a company of American soldiers -- ordinary young men from around the country -- to commit the worst atrocity in American military history?

Around age 12, Robert Stone created his first short film on environmental pollution in his New Jersey hometown. Commentary by Robert Stone.

The story of the modern environmental movement.

Passing environmentally friendly laws isn't always enough, as the 1960s' conflict between environmentalists and loggers proved.

The 1973 oil embargo highlighted US dependence on foreign oil.

Congressmen with poor environmental records were targeted for defeat in 1970.

What was the effect of Rachel Carson's book Silent Spring?

Looking back on 1970's first Earth Day celebration.

From AMERICAN EXPERIENCE: Earth Days - What were environmental conditions like in the US in the early 1960s?

From the 1960s to today, US Presidents have talked about saving our environment.

"Take no prisoners. Fight to the bitter end." Those were everyday words to combat troops on both sides at the end of World War II in the Pacific. And they led to an unprecedented orgy of slaughter. This provocative film looks at the escalation of bloodletting from both sides of that fight.

Special Film Project 153, produced by the Army Air Forces in 1945 and narrated by Hollywood actor and future president Ronald Reagan, is better known as Target Tokyo. The film follows the bombers' first mission, from crew training in Nebraska to deployment on the Pacific island of Saipan -- secured as an air assault launching point -- and then to Japan and the new aircraft's first bombing raid.