they were interested in the fur trade more than anything else
The correct answer is the declaration of independence.
It was mostly written by Jefferson and it pointed out to all the bad things the king has done against the colonies. These things were called grievances, and the grievances are the reason as to why they are breaking away from the empire in order to establish their own country.
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Because china needs a beating
France sold the Louisiana Purchase to the U.S. to gain funds for the Napoleonic Wars back in Europe. Thomas Jefferson took the offer for $15 million. This was an offer her couldn't miss! It more than doubled the size of the United States and gave the country access to the Mississippi River.