1775 – The American Revolution begins
http://www.history.com/this-day-in-history/the-american-revolution-begins
1876 – Wyatt Earp dropped from Wichita police force
http://www.history.com/this-day-in-history/wyatt-earp-dropped-from-wichita-police-force
1897 – First Boston Marathon held
http://www.history.com/this-day-in-history/first-boston-marathon-held
1964 – Mario Andretti competes in first Indy car event
http://www.history.com/this-day-in-history/mario-andretti-competes-in-first-indy-car-event
1995 – Truck bomb explodes in Oklahoma City
http://www.history.com/this-day-in-history/truck-bomb-explodes-in-oklahoma-city
