This Day in History: May 1--Haymarket Massacre

This Day in History: April 30--Saigon Fell

This Day in History: Chernobyl Nuclear Disaster Occurred

This Day in History: Findings on DNA Double Helix Was Published

This Day in History: The Nation's First Newspaper Began Publication

This Day in History: Teddy Roosevelt Delivers 'Citizenship in a Republic' Speech

This Day in History: April 22--Earth Day

This Day in History: April 21--Seattle World Fair Opens

This Day in History: April 20--Ludlow Massacre

This Day in History: April 19--Warsaw Ghetto Uprising Began

This Day in History: April 18--San Francisco Earthquake and Fire

This Day in History: April 17--Apollo 13 Safely Returned to Earth

This Day in History: April 16--National Bridges National Monument Was Established

This Day in History: April 15--President Lincoln Died

This Day in History: April 13--Jefferson Memorial Was Dedicated

This Day in History: April 12--Terry Fox Began His Marathon of Hope

This Day in History: April 11--Nevill Ground Burned to the Ground by Suffragettes

This Day in History: April 10--General Robert E. Lee Bid Farewell to his Confederate Army

This Day in History: April 9--The two-week Journey of Reconciliation began

This Day in History: The United Kingdom and France signed the Entente Cordiale