1. Land Rush of 1892: On April 19, 1892, the United States government opened up a large portion of Oklahoma Territory for settlement through a land run. Over 10,000 people participated in the Land Run of 1892, with many settlers clamoring to claim a piece of land that had previously been designated as Indian Territory.

2. Oklahoma City Bombing: On April 19, 1995, a domestic terrorist attack took place in downtown Oklahoma City when a truck bomb exploded outside the Alfred P. Murrah Federal Building. The attack killed 168 people and injured hundreds more, making it one of the deadliest domestic terrorism incidents in United States history.

3. Oklahoma Pioneers: On April 19, 1889, the first of several land runs took place in what was then Oklahoma Territory. Thousands of settlers rushed in to claim land previously set aside for Native American tribes.

4. Civil Rights: On April 19, 1965, civil rights activist Clara Luper led a group of people in a sit-in at the Katz Drug Store lunch counter in downtown Oklahoma City. The protest helped to desegregate the store and was a significant moment in the ongoing struggle for civil rights in Oklahoma.

5. Oil Industry: On April 19, 1930, the Cushing-Drumright Oil Field was discovered in Oklahoma. The oil field was one of the largest in the world at the time and helped establish Oklahoma as a major player in the oil industry.