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The Battles of Lexington and Concord on April 19, 1775, were the first major military actions between the British Army and Patriot militias from British America's Thirteen Colonies during the American Revolutionary War -
The Battle of Baltimore took place between British and American forces on September 12–14, 1814, during the War of 1812. Defending American forces repulsed sea and land invasions off the busy port city of Baltimore, Maryland, by British forces. The British and Americans first met at the Battle of North Point.
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"The Star-Spangled Banner" became the official U.S. national anthem on March 3, 1931, when President Herbert Hoover signed a bill into law, making the song official after a 1930 House of Representatives bill and subsequent Senate passage. The song, written by Francis Scott Key in 1814, had grown in popularity and served as the official anthem for the U.S. armed forces since 1916