Answer:
D. Limits were set about where slavery could spread in U.S. territories
Explanation:
In return to the limits of where slavery can spread, the US upheld that they will remain strict in catching and returning slaves, much to the displeasure of abolitionists in the North.
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Colorado has 9 electors because Colorado had 7 representatives in the House of Representatives and 2 senators in the senate for the state.
I believe the answer is: To control trade along the Mississippi River.
By controlling the Mississippi river, Thomas Jefferson believe that they could eliminate british influence in products distribution to different states. He counted that the amount of products transported from this river could accounted to around 500 million tons of shipped goods per year.