1. The Battle of Antietam
On September 17, 1862, the Battle of Antietam took place in Maryland during the American Civil War. It was the first major battle fought on Union soil and remains the single bloodiest day in American history, with over 23,000 casualties.

2. The Birth of a Founding Father
On September 17, 1730, Charles Carroll of Carrollton, one of the Founding Fathers of the United States, was born in Annapolis, Maryland. He was the last surviving signer of the Declaration of Independence and the longest-lived of all the signers, passing away at the age of 95 in 1832.

3. The Great Baltimore Fire
On September 17, 1904, the Great Baltimore Fire broke out. It destroyed over 1,500 buildings and caused millions of dollars in damage. The fire department was able to contain the blaze and prevent it from spreading to other parts of the city.

4. Thurgood Marshall Appointed to Supreme Court
On September 17, 1967, Thurgood Marshall was appointed to the United States Supreme Court. Marshall, a native of Baltimore, Maryland, was the first African American to serve on the Supreme Court. He served as an associate justice from 1967 to 1991.

5. Cal Ripken Jr. Breaks Record
On September 17, 1998, Cal Ripken Jr. of the Baltimore Orioles played in his 2,632nd consecutive game, breaking the record held by Lou Gehrig of the New York Yankees. Ripken's streak lasted 16 years and became a symbol of durability and perseverance in professional sports.