What political and economic changes occurred during the Civil War?

answer placeholder because the system is messed up

35 is your answer because i looked it up

"i care deeply about campaign finance reforms: - apex

the monroe doctrine is the best known u.s. policy toward the western hemisphere. buried in a routine annual message delivered to congress by president james monroe in december 1823, the doctrine warns european nations that the united states would not tolerate further colonization or puppet monarchs.