What document convinced people that the social contract had been broken before this was explained in the Declaration of Independence?

The Proclamation of 1763

Explanation:

I think the Proclamation of 1763 was written by the British to place control over the colonists to keep them from encroaching on the native American's lands. The colonists viewed this a way for the British crown to control them and saw it as a break in the social contract between Britian and the Colonies.

c, they united with once

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