1. Maryland was the 7th state to ratify the United States Constitution on June 10, 1788. The state's support for the Constitution was crucial in securing its adoption.

2. On June 10, 1861, the Battle of Big Bethel occurred in Virginia, near the Maryland border. Maryland soldiers fought on both sides of the conflict, with some joining the Union army and others supporting the Confederacy.

3. The Baltimore and Ohio Railroad, the oldest railroad in the United States, was incorporated on June 10, 1827. The railroad played a significant role in Maryland's economy and transportation infrastructure.

4. On June 10, 1924, the first Olympic trials were held at Johns Hopkins University in Baltimore. Maryland has produced many successful Olympic athletes over the years, including swimmer Michael Phelps and gymnast Dominique Dawes.

5. Maryland's state tree, the White Oak, was officially designated on June 10, 1941. The tree is known for its durability and longevity, with some specimens living for centuries. It is also an important symbol of the state's natural beauty and history.