What economy and contributing factor best complete this table? North | Factories | Numerous fast-flowing rivers South | Plantations | Fertile soil for the cash crops West | ? | ? Answers: A.1) mining 2) metal ores and minerals B.1) ranching 2) railroads to transport cattle to market C.1) large farms 2) slices used for labor D.1) cottage industry 2) mild weather that attracted immigrants