1. On July 22, 1841, the first steam-powered naval vessel, the USS Savannah, visited Baltimore.
2. July 22, 1864 saw the Battle of Monocacy, which is considered to be the "Battle that saved Washington" during the Civil War. This battle bought time for Union forces to reinforce the capital and prevented a Confederate invasion.
3. On July 22, 1882, the first electric streetcar line in Maryland began operation in Baltimore City.
4. July 22, 1898 marked the birth of Alexander Mitchell Palmer, a prominent politician who served as the US Attorney General under President Woodrow Wilson. Palmer is most known for his role in the "Red Scare" of 1919-1920, where he targeted perceived radical threats to the US government and society.
5. In 1933, on July 22, John D. Rockefeller Jr. donated land for the establishment of a national park in Maryland. This land eventually became part of the Catoctin Mountain Park.