W
orld War I: Germany institutes unrestricted submarine warfare.
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Today In History- February 22
Owner:This_Day_In_History
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Created:Jan 17, 2008
Modified: Jul 19, 2011
View Count: 136(Recent: 1)
Fold3, Today In History- February 22 (https://www.fold3.com/memorial/2190/today-in-history-february-22/facts : accessed May 3, 2024), database and images, https://www.fold3.com/memorial/2190/today-in-history-february-22/facts