What is the name of the flag that flew over Fort McHenry and inspired the song celebrated in America250 history?

The flag that flew over Fort McHenry and inspired the song celebrated in America250 history is the Star-Spangled Banner.

Mary Pickersgill and her assistants made the enormous garrison flag in Baltimore in 1813 and 1814. It measured about 30 by 42 feet and contained 15 stars and 15 stripes, representing the number of states in the Union at that time.

The flag flew over Fort McHenry during the British attack on Baltimore on September 13–14, 1814. Francis Scott Key saw it after the bombardment and wrote the poem that became the lyrics of “The Star-Spangled Banner.”

The flag is not the same as the modern U.S. flag. Since 1818, the national flag has used 13 stripes for the original colonies and one star for each state, rather than adding a stripe for every new state.