Describe the growth of cities in the latter part of the 1800s, both in regard to population and to their physical structural changes. What factors

Describe the growth of cities in the latter part of the 1800s, both in regard to population and to their physical structural changes. What factors lead to the growth of cities? How do you think the growth of cities impacted the future of America in terms of social issues, economic issues, or political issues? Be specific.