Fait général: 1917 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Fait mathématique: 1917 is the number of possible configurations of pegs (up to symmetry) after 27 jumps in solitaire.
Culture générale: 1917 is a boring number.
Date historique: March 31st is the day in 1949 that the Dominion of Newfoundland joins the Canadian Confederation and becomes the 10th Province of Canada.