Why did the u. s adopt a policy of expansion

If the U.S didnt  this would lead to the inevitable break up of the Soviet Union. Since the defeat of the Nazi's the Soviets because of their communist ideology and history were considered to be the largest threat to the Western World.

Explanation:

length of the cultivating season was not a problem of new england agriculture

the birthmark on georgiana's face alludes to the doctrine of "original sin," being tainted with evil from birth