| 1763 | |
| 1774 | |
| 1775 | | 19 Apr:
The first battles of the American Revolution. British troops fight American Minutemen at Lexington, killing eight. The British then move to Concord where they again engage the colonials. By the end of the battle, 93 colonists are dead. The British, having lost 273, retreat to Boston.LoC NPS |
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| 1776 | | 4 Jul:
The United States is founded when the Second Continental Congress declares its independence from Great Britain.USHistory USNA |
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| | 16 Sep:
George Washington gets his first victory in the Battle of Harlem Heights.MtVernon RW |
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| 1783 | |
| |
| 1784 | |
| 1787 | |
| | 17 Sep:
The U. S. Constitution is signed by 38 of the 41 delegates present at the Constitutional Convention.LoC CC |
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| 1788 | |
| 1796 | |
| 1814 | | 13 Sep:
Francis Scott Key writes the Star-Spangled Banner.SIMag LoC |
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| 1816 | |
The previous year, Mt. Tambora erupted producing so much ash and gas the sunlight was blocked from warming the earth causing the "Year Without Summer".USGS |
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| |
| 1830 | | 28 Aug:
The superiority of steam-power is demonstrated when the first American built locomotive, Tom Thumb, races a horse-drawn B&O rail car.FHWA B&ORRM |
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| 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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| 1863 | | 17 Sep:
The Battle of Antietam gives the Union a "victory", even though it is militarily a draw.ABT NPS |
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| 1877 | | 24 Jul:
For the first time, federal troops are used against striking workers.POLITICO WVCulture |
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| 1918 | | 7 Nov:
Dr. Robert Hutchings Goddard demonstrates tube-launched solid-propellant rockets at the Aberdeen Proving Ground in Maryland, the forerunners to the bazooka.ESA AFHF |
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| 1955 | | 19 Aug:
Hurricane Diane becomes the first storm to top $1 billion in damages in the U. S..NEHS NWS |
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| 1967 | | 30 Aug:
Thurgood Marshall becomes the first African American to be confirmed as a Supreme Court justice.USNA SCH |
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| 1973 | | 10 Oct:
U. S. Vice President Spiro T. Agnew resigns after pleading no contest to income tax evasion.Nation USHouse |
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| 1986 | |
Maryland
