[this is an essay question from apush, pls analyze how western expansion contributed to growing sectional tensions between the north and south. confine your answer to the period from 1800 to 1856.

i think it is a system for harvesting crops more easily

this link can you answer the question.

on a flat and narrow coastal plain, between the foothills of the brazilian highlands and the atlantic ocean, on the shore of guanabara bay, in the state of rio de janeiro, brazil, the tropical zone in south america.