On March 29, 1865, the final campaign of the Civil War begins in Virginia when Union troops under General Ulysses S. Grant move against the Confederate trenches around Petersburg. General Robert E. Lee’s outnumbered Rebels were soon forced to evacuate the city and begin a desperate race west.

In one of the most sensational trials in American history, Julius and Ethel Rosenberg are convicted of espionage for their role in passing atomic secrets to the Soviets during and after World War II. The husband and wife were later sentenced to death and were executed in 1953.

In March of 1958, Dr. Charles David Keeling begins regularly measuring the amount of carbon dioxide in the atmosphere from the Mauna Loa Observatory in Hawai'i. Over the ensuing years, his research will reveal what is now known as the Keeling Curve: a graph of continuously-taken measurements showing the rapid accumulation of carbon dioxide.

Lt. William L. Calley is found guilty of premeditated murder at My Lai by a U.S. Army court-martial at Fort Benning, Georgia. Calley, a platoon leader, had led his men in a massacre of Vietnamese civilians, including women and children, at My Lai 4, a cluster of hamlets in Quang Ngai Province on March 16, 1968.

On March 29, 1974, prominent Soviet author, historian and political dissident Aleksandr Solzhenitsyn is reunited with his family after being exiled from his home country. Publication of The Gulag Archipelago, his detailed history of the Soviet Union's vast system of prisons and labor camps, helped raise global awareness of the communist nation's rampant political repression. Its publication led Soviet authorities to arrest him for treason, strip him of his citizenship and physically expel him from the U.S.S.R. in February 1974.