1. On October 19, 1781, British troops surrendered at Yorktown, Virginia, effectively ending the Revolutionary War. This victory had a significant impact on Delaware, which had been a key state in the war effort.

2. On October 19, 1824, the first steam-powered locomotive arrived in Delaware. This marked the beginning of a new era for transportation in the state, and ultimately helped to spur economic growth.

3. On October 19, 1864, the Battle of Cedar Creek took place in Virginia. Many soldiers from Delaware fought in this significant Civil War battle, which helped to turn the tide of the war in favor of the Union.

4. On October 19, 1903, Wilbur Wright made his first successful flight in a heavier-than-air machine. Though not in Delaware, the Wright brothers were from Dayton, Ohio, which has strong connections to Wilmington and other parts of Delaware.

5. On October 19, 1983, the US Senate declared October 19 "National Mammography Day". This day is now observed annually as a way to promote breast cancer awareness and encourage women to get regular mammograms.