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A portion of land can best be described as a __________.
A.
state
B.
territory
C.
boundary
D.
physical feature




2)After the United States purchased the Louisiana Territory, America’s western boundary shifted to the __________, which is a(n) __________ boundary.
A.
Mississippi River . . . visible
B.
Mississippi River . . . political
C.
Rocky Mountains . . . physical
D.
Rocky Mountains . . . imaginary



3)Political issues that may lead to the creation of political boundaries include __________.
A.
shifts of riverbeds
B.
extreme climate changes
C.
conflicts between two neighboring groups
D.
trade agreements between existing countries