What is the most likely reason cities became dirty and overcrowded during the Industrial Revolution?

During the early period of spanish colonialism, the death of large numbers of native people led to what

Which of the following answer best explains the ideals or principles led to the concept of manifest destiny? a americans wanted the european countries to stay out of the north american continent. b americans felt they had a god-given duty to protect the land of the native americans. c americans thought they had a god-given duty to spread their culture and government. d americans learned about this concept from the native americans tribes had encountered.

The united states highway system is a what in the united states numbered within a national grid