.. How did the expansion of railroads impact the development of the United States?

The expansion of railroads impacts the development of the United States by creating jobs, establishing a national market, establishing a cattle industry on the Plains, and allowing certain people to acquire great wealth through investing in the railroad.

answer; /// i do believe its the ; //(iroquois)they were made up of several groups who spoke a common language;

answer; the president uses mass media to gain support for policies;