11. After the Revolutionary War, the western border of the United States was the
Answer: A
The western border of the United States was the Mississippi River.
After the Revolutionary War, the United States' western border was established at the Mississippi River, as defined by the Treaty of Paris in 1783.
A) Mississippi River.
This option is correct because the extract explicitly states that the Treaty of Paris of 1783 moved the nation's western border to the Mississippi River, marking it as the boundary after the Revolutionary War.
B) Gulf of Mexico.
This option is incorrect since the Gulf of Mexico is not a western border but rather a southern boundary of the United States. The extract does mention territorial acquisitions related to the Gulf of Mexico, but these do not pertain to the border established after the Revolutionary War.
C) Rocky Mountains.
This option is incorrect as the Rocky Mountains are located much farther west than the Mississippi River and were not recognized as the western boundary of the United States following the Revolutionary War. The extract does not indicate any border related to the Rocky Mountains during this period.
D) Great Lakes.
This option is incorrect because the Great Lakes are located to the north of the United States and do not serve as a western boundary. The extract does not discuss the Great Lakes in relation to the western border established after the Revolutionary War.
Conclusion
The Mississippi River is definitively the correct answer as it was established as the western border of the United States by the Treaty of Paris in 1783. All other options fail to represent the accurate historical context of the United States' territorial boundaries after the Revolutionary War.