American War of Independence

American War of Independence a.k.a. Revolutionary War or American Revolution was a conflict between Great Britain and the America colonies.

The Rani visited Earth during the war to collect brain chemicals from humans. (DW: The Mark of the Rani)

The Doctor claimed to have participated in the Boston Tea Party, a precursor to the actual war. (DW: The Unquiet Dead) The Doctor later claimed to have helped write the Declaration of Independence convincing the authors to add "the pursuit of happiness" and kept a copy of the first draft in a tuxedo pocket. (DW: The Lazarus Experiment, deleted scene)

Other references
Barbara mentioned the Boston Tea Party in her attempt confuse the Daleks. (DW: The Dalek Invasion of Earth)