Question

In 1840, the population of Chicago was only 4,470. By the 1900, the city's population was 1,698,575. Which factor best explains the population change?

Answer 1

http://physics.bu.edu/~redner/projects/population/cities/chicago.html

http://en.wikipedia.org/wiki/Demographics_of_Chicago#Population

Let us know what you think.

Answer 2

Anyone answer it.

Answer 3

Those links did not help

Answer 4

those links didn't help at all