The end of the Civil War kicks off a new era of radical political, economic, and technological growth. The Reconstruction period was riddled with political corruption and a perverse attempt at civil reform. As the time period progressed, "Big Business" took control of the nation and catapulted the American economy into international prestige. Expansion efforts--led by the charge of railroads--finally close the frontier and open new ideas to American expansion: overseas. Meanwhile, the United States population, stimulated by another immigration boom, will seek answers to the problems of overcrowding in cities, labor abuse in industry, and the gross misrepresentation of middle-class Americans.