The growth of the railroad industry in the United States led to
Answer choice 1: The centralization of economic and political power into a small number of corporations and trusts.
Answer choice 2: A rapid and successful push for government regulation of big businesses and the breakup of monopolies.
Answer choice 3: The fragmentation of large monopolies as small factories gained access to larger markets.
Answer choice 4: An increase in the political power of Midwestern farmers whose goods could be sold across the nation.
