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The colonists valued their rights so highly because the king of England didn’t give them any freedoms or rights. The colonists didn’t have any of the rights that we have today so they fought hard to make sure everyone was treated fairly. It’s the only just thing to do.
The French-Indian was extremely costly. It left Britain with a huge debt. The British thought the colonists were to pay the debt because they were defending the colonies from the French. Britain also maintained a standing army in American colonies which was a huge financial stress. As a result, Great Britain taxed the colonies.