Concept
Version 7
Created by Boundless
Concurrent Powers
Source
Boundless vets and curates high-quality, openly licensed content from around the Internet. This particular resource used the following sources:
"Scene at the Signing of the Constitution of the United States."
http://en.wikipedia.org/wiki/File:Scene_at_the_Signing_of_the_Constitution_of_the_United_States.png
Wikipedia
Public domain.