Answer:
"establishing borders with Canada and Mexico"
the answer is A.) people are self sufficient economically
Answer:
C) the Louisiana Purchase.
Explanation:
The Lousiana Purchase added 828,000 square miles to the US territory in 1803. In comparison, the US won 525,000 square miles with signing the Treaty of Guadalupe Hidalgo that ended the Mexican-American War in February 1848.
The overall outcome of the war was threefold:
The trial and execution of Charles I (1649)
The exile of his son, Charles II (1651)
The replacement of English monarchy with, at first, the Commonwealth of England (1649–53)