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.
John Green explains some of the decisions of the Roman empire that led to its demise. Most notably, Rome tried to incorporate conquered people into Roman culture, which worked in the early days of the empire, but eventually led to barbarians inside the gates.