Name one negative that Paris and New York City had in common in the late 1800s/early 1900s.

Population growth completely changed the face of Paris and New York City.

Explanation:

During the late 1800s and in the early 1900s, population growth and industrial expansion in the cities became common. Both cities were filled with buildings and people who engaged in trade and commerce. The noises, slums, air pollution, traffic jams, and health problems became commonplace in cities.