The establishment of presidential term limits.
To protect the rights of employees, support collective bargaining, and put an end to the abusive practices of antiunuion employers
Propaganda, they inspired more people to join the fight on America's side.
Talk about the three G's; Gold, Glory, and God.
Also, at the time, land was equal to power. The more land you had, the richer you were. This is a social and political reason, as well as economic.
Hope this helps you. Ask any questions if you need to!