| 1582 | | 4 Oct:
The Gregorian calendar is introduced. The next day is October 15th.Britannica UFL |
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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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| 1845 | | 13 Sep:
The Irish Potato Famine begins with reports of blight in Gardeners' Chronicle.IC IP |
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| 1866 | | 27 Jul:
Cyrus W. Field finally succeeds in laying the first working trans-Atlantic Telegraph cable from Ireland to Newfoundland.N&LH PBS |
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| 1914 | |
| 1916 | | 24 Apr:
Easter Rising - Ireland rises up against British rule and proclaims its independence.B B C IC |
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| 1918 | | Feb:
The Spanish Flu pandemic kills at least 3% of the World's population.VLib npr |
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| 1919 | |
| 1939 | |
| 1945 | | 7 May:
Germany unconditionally surrenders, effectively ending World War II in Western Europe. Soviet surrender terms were signed the next day.DoD USHMM |
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| | 24 Oct:
The United Nations is established.UN USState |
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| 1949 | | 4 Apr:
NATO, or the North Atlantic Treaty Organization, is founded.USNA Avalon |
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| 1987 | | 3 Jul:
In a little over a day, Richard Branson and Per Lindstrand complete the first Atlantic crossing in a hot air balloon.LT GN |
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Ireland
