During which decade did transcontinental rail service begin in the United States?
A.1850_1860
B.1860_1870
C.1870_1880
D.1880_1890

Respuesta :

B they had finish part of it in 1869 and it had taken them six years so that means they started building it in 1863. Then they had continued after that but it was small sections of them adding to the existing railroad.
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