1. In 1790, the state of Maryland ceded a portion of land to the federal government which would later become the District of Columbia, the capital of the United States.

2. On October 10, 1780, the Battle of Kings Mountain took place during the American Revolutionary War. Maryland soldiers played a significant role in this battle, which resulted in a pivotal victory for the American forces.

3. The Baltimore and Ohio Railroad Company was chartered on October 10, 1827. This railroad would become a major transportation hub in the mid-Atlantic region, connecting major cities and helping to drive the industrial revolution.

4. On October 10, 1998, the Baltimore Orioles defeated the Cleveland Indians in game four of the American League Championship Series. This win clinched the series for the Orioles, sending them to the World Series for the first time since 1983.

5. The Johns Hopkins University, one of the nation's most prestigious universities, was founded on October 10, 1876. It would go on to become a major center for research and innovation in fields ranging from medicine to engineering.