1. Maryland became the seventh state to ratify the U.S. Constitution on July 28, 1788. This was a significant moment in American history as it helped establish the federal government and its role in shaping the nation.

2. On July 28, 1864, Union forces led by General William Wallace were defeated by Confederate troops at the Battle of Kernstown II in Winchester, Virginia. The battle was significant as it delayed Union forces from advancing towards the Confederate capital in Richmond.

3. The Chesapeake and Ohio Canal, a major transportation route for goods and people, was officially opened on July 28, 1850. The canal spanned 184.5 miles from Cumberland, Maryland to Washington, D.C. and was used for over 100 years before being replaced by rail and road transportation.

4. The infamous Baltimore Colts marching band performed for the last time on July 28, 1971. The Colts were a beloved football team in Baltimore before they famously moved to Indianapolis in 1984. The marching band was known for their high-energy performances and was a fixture at Colts home games.

5. The Great Fire of Baltimore began on July 28, 1904, and destroyed over 1,500 buildings across 70 city blocks. The fire lasted for over 30 hours and left tens of thousands of people homeless. The city was eventually rebuilt and the incident led to improvements in fire safety standards across the country.