For the Constitution to take effect, nine states required to ratify it, according to Article VII. The state conventions served other purposes in addition to the legal requirements for ratification. During the Philadelphia convention, the Constitution was drafted in complete secrecy.
There is no key to civilization. The concept that native americans did not have a civilization or were not civilized is one only supported by the egotism and arrogance of the empirical profit oriented "conquerers" who have worked to eradicate all cultures that conflict with profits. The key to western civilization that allowed them to kill off the majority of the natives was a lack of respect for life and insane drive for control, ownership and dominance, to which the peaceful and sophisticated Natives would not stoop.
An example of cultural change for the united states in this time period would be seen in how the united states started to impress their culture upon the world in showing that they were the “top dog” in the world wars. this cultural shift towards exerting dominance lead up to the cold war.