The American Legion's birthday is March 15, the day in 1919 when the first American Legion caucus took place in Paris. The American Legion is the largest veterans organization in the country, with around two million members and over 13,000 posts worldwide. The organization was founded by members of the American Expeditionary Forces who were still in Europe after World War I. The Legion's core principles are Americanism, veterans, youth, and national defense. So a very happy 105 years today