Answer:
In 1862, Congress passed the Pacific Railway Act, which authorized the construction of a transcontinental railroad. Four of the five transcontinental railroads were built with assistance from the federal government through land grants.
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The contributions of African Americans for the Union war effort in the Civil War pushed the federal government, controlled largely by the republican party, to exchange the course of action and affected the consequences which included but were not limited to the amendment of the constitution to give certain rights to african americans.
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It was primarily tied up in the slave economy.
