1. Delaware's first Constitution was adopted on March 19, 1776. Known as the "Duke of York's Laws," it established a framework for government that recognized popular sovereignty and established the powers of the General Assembly and governor.

2. On March 19, 1812, Delaware was admitted to the Union as the 1st state to prohibit slavery in its constitution. The state's stance on slavery was critical in shaping the outcome of the American Civil War.

3. The Wilmington and Western Railroad, a historic tourist attraction, was incorporated on March 19, 1867. The railway operated out of Wilmington for over a century and is now a popular spot for visitors to Delaware.

4. The state's official tree, the American holly, was designated as such on March 19, 1939. The long-lived evergreen is common throughout Delaware and is often used for ornamental purposes during the winter months.

5. The Delaware River and Bay Authority, which operates several major transportation facilities in the state, was created on March 19, 1962. The authority oversees the Delaware Memorial Bridge, Cape May-Lewes Ferry, and several regional airports, among other facilities.