| 1790 | |
| 1792 | |
| 1793 | | 18 Sep:
The cornerstone to the U. S. Capitol building is laid by George Washington.USSenate AoC |
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| 1800 | | 1 Nov:
John Adams moves into the White House, the first President to do so.Whitehouse WHHA |
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| 1802 | |
| 1814 | |
| 1844 | | 24 May:
Samuel F. B. Morse transmits the message "What hath God wrought?" from Washington to Baltimore using his invention, the telegraph.LoC APS |
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| 1846 | | 10 Aug:
The Smithsonian Institute is founded.SI USNA |
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| 1851 | | 24 Dec:
A fire at the Library of Congress destroys nearly two thirds of the books purchased from Thomas Jefferson.LoC AoC |
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| 1865 | | 14 Apr:
President Abraham Lincoln is shot by John Wilkes Booth at Ford's Theatre.LoC Ford's |
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| 1880 | | 3 Jun:
Alexander Graham Bell transmits the first wireless telephone message on his newly invented photophone.LoC Vice |
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| 1884 | | 1 Nov:
Greenwich Mean Time is adopted universally when the International Meridian Conference meets in Washington, DC.GMT OFA |
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| 1890 | | 11 Oct:
The Daughters of the American Revolution is founded.DAR FairPark |
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| 1923 | | 24 Dec:
A U. S. national Christmas tree is lit for the first time.NPS WHHA |
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| 1930 | | 24 Jun:
Preliminary testing of what will later become Radar begins.I&T GoogleBooks |
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| 1933 | | 12 Mar:
Franklin Delano Roosevelt's first "fireside chat" is broadcast.npr MC-UVA |
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| 1947 | | 20 Oct:
The House Un-American Activities Committee opens an investigation of communism in Hollywood.N TIME |
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| 1963 | |
| | 28 Aug:
Martin Luther King Jr. delivers his "I have a dream" speech.VLib npr |
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| 1972 | | 17 Jun:
Police arrest five men for breaking into the Democratic National Committee headquarters at the Watergate Hotel Complex in Washington, D. C.USNA FBI |
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| 1986 | |
| 2001 | |
| 2021 | | 6 Jan:
Insurrectionist members of the cult whose leader occupies the White House, force their way into the Capitol building in an attempt to overturn the results of the 2020 U. S. Presidential election.Vox WAPO |
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| 2024 | | 21 Jul:
Joe Biden decides to end his run for re-election. He then endorses Kamala Harris as the Democratic presidential nominee.POLITICO B B C |
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