Because on the 11th minute of the 11th hour of the 11th day of the 11th month the Armistice to end the War to End All Wars was signed, bringing an end to the hostilities of World War One.
Veteran's Day was originally "Armistice Day", to observe the end of WWI by armistice on the 11th hour of the 11th day of the 11th month, 1918.
Armistice was declared on November 11 of 1919. It was then called Armistice day. Later on it was declared Veterans Day in order to honor all who have served in the military.
November 11
November 11th
November the 11th.
11th November 1990 was a Sunday.
11th November 1925 was a Wednesday.
Veterans Day is celebrated on the 11th of November.
November 11th was selected as Veteran's Day. The holiday was originally called "Armistice Day", because on the 11th hour of the 11th day of the 11th month, an armistice ended WWI.
11th November 1959 was a Wednesday.
November 11th, 1968 fell on a Monday.
November 11th, 2002 fell on a Monday.
November 11th, 1935 fell on a Monday.
11am 11th November 1918, WW1 officially ended.