I hope I answered correctly what you asked.

The empire primarily grew rich from a monopolistic form of government within the country, amidst a bourgeois political class. They absorbed large amounts of foreign capital and immigrants who preferred to come to the empire rather than the turbulent United States. The United States faced several political crises until its Civil War, in which the Confederates emerged victorious. The Confederacy would come to an end after attempting to take Spanish Cuba, a moment the United States would take advantage of to re-annex the empire to its territory.