It is containment. .........................................
<span>What was not a reason for westward expansion in the americas in the 1800's?
</span><span>B. decreased immigration
The Westward expansion was brought about by the increasing number of population as well as the need to acquire more land to farm and produce crops. Gold was discovered in the west during those times thus increasing the number of people migrating to the west.
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A large area of tide water
