Question

Following the american civil war, northern cities saw an increase in population thanks in part to

Answer 1

The freed african descendents went to make their lives in the north.

The north managed to make an effort to develop an economic structure.

Step-by-step explanation:

The American Civil War caused the urbanization of western lands and central American areas, further contributing to economic growth, industrial expansion, and the development of US capitalism.

Despite the financial difficulties faced by the Union throughout the war, thanks to the war effort, the North has grown surprisingly, especially in metallurgy, rail, arms and naval. In addition to technological development, there have been gains in the field of medicine, schools and higher education institutions. Trade grew exponentially, spreading throughout the United States. The US culture standard became the northern ideal of "hard work, education, and economic freedom for all," and eventually would make the United States the largest economic power in the world.

Answer 2

i think it's because many of former slaves run to the northern region after the Civil war.
Beside that, the northern region of the united states were more socially, industrially, and economically advanced compared to the southern part

hope this helps