Cotton became the most profitable crop in the South mainly because of the——
A. use of irrigation on plantation
B. Whitney’s cotton gin
C. slave labour
D. improved agricultural techniques
Gold was discovered in California in ——————
A. 1828
B. 1838
C. 1848
D. 1858
The first transcontinental railroad in the US was completed in————
A. 1850
B. 1859
C. 1869
D. 1890
The agricultural Adjustment Act was an attempt to deal with the farmers’ problem of ————
A. soil erosion
B. declining labor supply
C. inflation
D. overproduction