Final answer:
The purpose of President Wilson's posters during World War I was to promote support and encourage participation in the war effort.
Step-by-step explanation:
The purpose of President Wilson's posters was to promote and encourage support for various war efforts during World War I.
President Wilson used these posters as a form of propaganda to shape public opinion and galvanize the American people to rally behind the war effort. The posters were designed to evoke emotions, invoke patriotism, and encourage citizens to contribute to the war by buying war bonds, conserving resources, and enlisting in the military.
Some famous posters from this time include the 'I Want You for U.S. Army' poster featuring Uncle Sam and the 'Food Will Win the War' poster, each with a strong message to motivate the public.
Learn more about President Wilson's posters and their purpose during World War I