By making newsreels and propaganda
By helping with the Voice of America
Many stars toured the country helping to sell War Bonds. Carole Lombard died in a plane crash on one such tour.
War movies were made for morale purposes.
Many actors such as Clark Gable and James Stewart volunteered for the armed services.
They delivered short, patriotic speeches to gain support for the war.
The continental congress was unicameral in nature to avoid disputes with in itself. As a bicameral congress can cause issues inside itself.
The stronger countries in Europe in the 1400s and 1500s - England, Spain, France and Portugal. :D!