The American Legion is founded in Paris at the first caucus by members of the American Expeditionary Force.

Caucus meeting in St. Louis adopts "The American Legion" as the organization's official name. The Legion's draft constitution is approved, and so is its preamble, which begins: "For God and Country, we associate ourselves together. . ." The preamble, with its heartfelt dedication to freedom and democracy, is still recited today at official gatherings of The American Legion.

The first "Flag Code" is drafted during a conference called by The American Legion in Washington, D.C. The code eventually was adopted by Congress in 1942. Today, the Legion is at the forefront of efforts to gain a constitutional amendment to protect the American flag from physical desecration.

American Legion Baseball program is created. Today, more than 60 percent of professional baseball players are graduates of The American Legion Baseball program. About 89,000 high-school-age youths play on Legion-sponsored teams each year.