| 1638 | | 29 Mar:
Swedish colonists establish a settlement near present day Wilmington, Delaware, naming it Nya Sverige, New Sweden.F&P DEGov |
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| 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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| 1783 | |
| 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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| 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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| 1888 | | 11 Mar:
The Great Blizzard of March 1888 or the Great White Hurricane, hits the northeastern United States.HI LoC |
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| 1937 | | 16 Feb:
Linear Condensation Polymer, better known as Nylon, is patented by Wallace Carothers of DuPont.SN AH |
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| 1950 | |
| 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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| 1986 | |
Delaware