April 17 – Sir Ralph Abercromby unsuccessfully invades San Juan, Puerto Rico, in what will be one of the largest British attacks on Spanish territories in the western hemisphere, and one of the worst defeats of the English navy for years to come.
May 10 – The first ship of the United States Navy, the frigate USS United States (1797), is commissioned.
July 8 – Senator William Blount of Tennessee becomes the first individual to be expelled from Congress for treason and conspiracy to incite rebellion.
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