How railroads contributed to the population and industrial growth in Minnesota/North Dakota

How railroads contributed to the population and industrial growth in Minnesota/North Dakota
MUST use at least 8 sources. 4 primary and 4 secondary. Chicago style formatting. 15 pages NOT INCLUDING works cited. This is for a high level college class so please write to that quality. NO pictures or graphs within the paper. Its supposed to be regional history so pertain everything to MN/ND please.