Portal:United States/Anniversaries/March/March 9
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- 1841 – The Supreme Court of the United States rules in United States v. The Amistad that a group of Africans who seized control of the slave-trading ship carrying them had been taken into slavery illegally.
- 1862 – In the American Civil War, the first battle between two ironclad warships, a five-hour battle near Hampton Roads, Virginia between the {{USS|Monitor}} and the {{ship|CSS|Virginia}}, results in a draw.
- 1932 – The first Ford Flathead engine leaves the assembly line at Ford Motor Company.
- 1933 – Congress begins enacting New Deal legislation after President Franklin Delano Roosevelt submits the Emergency Banking Act in an effort to halt the Great Depression.
- 1959 – The Barbie doll (pictured) debuts.
- 2007 – The US Justice Department releases an internal audit that finds that the FBI illegally used the USA Patriot Act to secretly obtain personal information about American citizens.
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