Concept
Version 13
Created by Boundless
The Growth of Cities
Daguerreotype of Philadelphia, Pennsylvania, at the corner of 8th and Market Streets, 1840
Philadelphia was the largest metropolitan center in the United States in the early 1800s.
Source
Boundless vets and curates high-quality, openly licensed content from around the Internet. This particular resource used the following sources:
"Philadelphia 8th & Market 1840."
http://en.wikipedia.org/wiki/File:Philadelphia_8th_&_Market_1840.jpg
Wikipedia
Public domain.