Why does president polk think the u. s. should extend its borders?

Territorial expansion of the United States on the Pacific coast was foremost in the minds of President Polk and his associates in their whole conduct of the war. The major consequence of the war was the Mexican Cession of the territories of Alta California and Santa Fe de Nuevo México to the United States under the Treaty of Guadalupe Hidalgo. In addition, Mexico accepted the loss of Texas and the Rio Grande boundary.

after the roman empire, the catholic church began to unify by taking on many duties of a government.

i'm pretty sure the answer would be

c. england

hope this best of luck sorry if i'm wrong

~animaljamissofab ♥