The phrase best completing the given list is the settlement of Americans in the West.
The list of the given phrases is interconnected with each other. They are the next occurred events or the results after the previous action.
The list is about the purchase of Louisiana that eventually doubled the size of the United States. The increase in the size of the United States gave Americans control of the policies and monitoring of the Mississippi River.
As per the location of the Mississippi River in the West, even the Americans tend to settle in the West for increasing their trades and businesses by setting in the west near the Mississippi River.
Therefore, option C is correct.
To know more about Louisiana purchase, refer to the link:
https://brainly.com/question/2882580
