Answer:
Congestion, pollution, crime, and disease were prevalent problems in all urban centers; city planners and inhabitants alike sought new solutions to the problems caused by rapid urban growth.
Industrial expansion and population growth
Explanation:
.
Solar Power Is the answer to this question
Slavery would've been outlawed.
C.) It is a secret route that slaves took to escape from Southern slave states to the North. Even though Harriet Tubman started this, it wasn't to help slaves become free it was to help them escape so it's C