Farming in the early New England colonies was challenging because English laws restricted which crops farmers could plant.
unfamiliar weather and soil conditions affected cultivation.
foreign plants soon grew out of control in the American soil.
English investors promoted manufacturing over farming.

Quick using the information in the graph, one might speculate that a) w.w.i created increased job opportunities in the u.s. b) the election of president hoover in 1936 caused unemployment to decline. c) the return of soldiers following w.w.ii caused unemployment to increase in the u.s. d) the new deal programs of president roosevelt created employment opportunities in the u.s.