1. On April 28, 1788, Maryland became the seventh state to ratify the United States Constitution, which laid the foundation for the country's government and laws. This important day is celebrated annually as Maryland Day.

2. In 1863, during the American Civil War, Union troops under the command of General Joseph Hooker engaged Confederate forces in the Battle of Chancellorsville, Virginia. Although the Union forces outnumbered the Confederates nearly 2-to-1, they suffered a significant defeat, and Hooker was forced to retreat.

3. On April 28, 1945, Italian dictator Benito Mussolini was captured by partisans while attempting to escape to Switzerland. He was later executed by firing squad, marking the end of his reign of terror and the fascist regime in Italy.

4. In 1967, a magnitude 6.5 earthquake struck western Washington, causing widespread damage and injuring over 250 people. The earthquake, which was one of the largest to hit the region, also triggered landslides and prompted the construction of new guidelines for building codes in earthquake-prone areas.

5. On April 28, 2017, the world's largest tunnel boring machine, nicknamed "Bertha," completed its nearly 2-mile journey under downtown Seattle, Washington. The machine had been digging the State Route 99 tunnel since July 2013, and its successful completion marked a major milestone in the multi-billion dollar project.