1. In 1775, on April 19, the American Revolutionary War began with the battles of Lexington and Concord in Massachusetts. Although the battles did not take place in Delaware, they had a significant impact on the state's history and its role in the war.

2. On April 19, 1812, Delaware became the first state to ratify the Constitution's requirement that one senator and at least one representative be elected from each state. This paved the way for equal representation of states in Congress.

3. In 1861, on April 19, Delaware Governor William Burton issued a proclamation stating that the state would remain loyal to the Union during the Civil War. Delaware played a crucial role in the Union's victory due to its strategic location between the North and the South.

4. On April 19, 1909, the University of Delaware was founded in Newark, Delaware. The school has since become a prominent institution of higher education and is known for its research in various fields, including agriculture, engineering, and biology.

5. In 1938, on April 19, the state of Delaware passed a minimum wage law, becoming one of the first states in the country to do so. The law mandated a minimum wage of 25 cents per hour and helped improve working conditions and raise living standards for many Delaware workers.