The best answer is C. a war between the two countries.
The boundaries between the United States and Mexico changed drastically due to the Mexican-American War (1846-1848), which resulted in significant territorial gains for the United States.
A.
a revolution in America
B.
changes in technology
C.
a war between the two countries
D.
the collapse of the Mexican government
Please select the best answer from the choices provided
A
B
C
D
The best answer is C. a war between the two countries.
The boundaries between the United States and Mexico changed drastically due to the Mexican-American War (1846-1848), which resulted in significant territorial gains for the United States.