Portal:United States/Anniversaries/May/May 22
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- 1807 – A grand jury indicts former Vice President Aaron Burr (pictured) on a charge of treason.
- 1819 – The SS Savannah leaves port at Savannah, Georgia, United States, on a voyage to become the first steamship to cross the Atlantic Ocean. The ship arrived at Liverpool, England on June 20.
- 1906 – The Wright brothers are granted U.S. patent number 821,393 for their "Flying-Machine".
- 1915 – Lassen Peak erupts, it is the only mountain to other than Mount St. Helens to erupt in the continental United States during the 20th century.
- 1947 – In an effort to fight the spread of Communism, President Harry S. Truman signs an act into law that will later be called the Truman Doctrine. The act grants $400 million in military and economic aid to Turkey and Greece.
- 1967 – Mister Rogers' Neighborhood, the longest running children's series on U.S. television, airs its first episode.
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