Question

As city populations increased in the early 1900s, cities...

Answer 1

The correct answer is "grew up and out". The 1900s was a decade of city populations growth in the United States, changing from about more than 3 million in 1900 to 4.7 million in 1910. As city population increased, the cities territories grew up and out, expanding their territories to support all the people that born or move out to live there.

Answer 2

As city populations increased in the early 1900s, cities grew up and out.