Answer:
the buffalo would return
Explanation:
correct me if I'm wrong goodluck:)
The evidence that proves that the Indus civilization included a well organized government was their cities were laid out in an organized pattern, and they had a complex plumbing system. They also had a system of weights and measures.
It would be the "Constitution" that was completed in 1787, since this came after both the Declaration of Independence and the Articles of Confederation, but before the Gettysburg Address.