Scrooge McDuck tells the story of how and why he emigrated to America. His parents believed in the American Dream and felt he deserved better, so they encouraged him to earn the money to move overseas. After working smarter, not harder, he earned the money he needed to move in a few months.
When the other mice warn of a cat, Fievel doesn't believe them. His father once told him that cats don't exist in America, and he shares that belief. He changes his mind and runs for his life when a black cat attacks him in an attempt to eat him.