What are the similarities and differences in the mobilizations for both world wars?

Preparation in the United States for both World War I (1917–19) and World War II (1941–45) had many similarities. Most of the similarities focused on organizing the economy for war, but other facets of the government's wartime policy from the First World War were more or less copied in the Second.
In both wars, the US government organized the economy for the war effort. These were "total wars," which means that nearly every facet of the economy was geared toward the war effort. When the country entered World War I in April 1917, the Wilson administration formed the War Industries Board to transfer civilian production to war production. Franklin Delano Roosevelt formed a similar organization at the end of 1941 called the War Production Board. Both organizations aided industries in retooling factories, allocating resources, and setting priorities for wartime material. Both organizations also ran rationing programs of much needed materials such as rubber, aluminum, clothing and food.
Both wars also saw the reallocation of labor into wartime factories. With men heading off to war, it was a priority to get personnel into industry. Women and African Americans played a key role in this regard. During the years of WWI, some one million African Americans left the harsh discrimination of the Jim Crow South to work in northern factories, an event known as the Great Migration. Women also played a key role in factory production during both wars, but especially WWII. A government propaganda campaign, featuring figures such as Rosie the Riveter, encouraged women to enter industries that in the past were reserved for men, including building battleships, building airplanes, and other areas of wartime production.
Propaganda also played a role in each war. In WWI, there was much opposition to the war at home, especially from socialist groups. The Wilson administration organized the Committee on Public Information, known as the Creel Committee, to run an advertising campaign to encourage support for and participation in the war effort. FDR's program was called the Office of War Information and focused its campaign on rationing drives, selling war bonds, and promoting industrial efficiency.