whAt wAs thE mAjor ChAngE in AgriCulturE During thE 19th CEntury
A、Crop proDuCtion BECAmE inCrEAsingly spECiAlizE
D、
B．EConomiC DEprEssions lowErED thE priCEs oF FArm proDuCE.
C．nEw BAnking lAws mADE it EAsy to Buy FArmlAn
D、
D、thE unitED stAtEs inCrEAsED its AgriCulturAl imports.