C) Great Britain
The Treaty of Paris of 1763 resulted in France forfeiting most of their north american land. They gave all their land to the east of the Mississippi river over to British rule within the British colonies.
The trade exchanges had several positive affect on the city of Timbuktu. The city started becoming wealthy due to numerous trade exchanges. This wealth attracted many people from outside and made the city of Timbuktu very powerful. I hope that this is the answer that has come to your desired help.
Answer: The westward expansion carried slavery down into the Southwest, into Mississippi, Alabama, crossing the Mississippi River into Louisiana. Finally, by the 1840's, it was pouring into Texas. So the expansion of slavery, which became the major political question of the 1850's, was not just a political issue.