Answer A. The Cotton Industry
Between 1880 and 1900, cities in the United States grew at a dramatic rate. Owing most of their population growth to the expansion of industry, U.S. cities grew by about 15 million people in the two decades before 1900. Many of those who helped account for the population growth of cities were immigrants arriving from around the world.
Industrial expansion and population growth radically changed the face of the nation's cities. The industrial revolution based basically on the cotton industry was most attractive to the new immigration from the east.
