At least 55 percent. The 2,500-plus collection, which spans both world wars and beyond, was created through the work of the first librarian of The American Legion Library, Verna B. Grimm. The posters are largely directed at the homefront – recruiting, morale, tips to keep the war effort going, etc.

The U.S. entry into World War II was spurred by the Dec. 7, 1941, attack on Pearl Harbor. The pictured poster is among those framed and hanging on the first floor of National Headquarters in Indianapolis. Learn more about the entire collection and see a gallery here.