How did the federal government help railroads to grow during this period?

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Explanation:

Railroads, as private companies, needed to engage in profitable projects. So the federal government passed the Pacific Railroad Act that provided land grants to railroads. This provided public lands to railroad companies in exchange for building tracks in specific locations.

congress failed to remove johnson. but it did succeed in getting control of efforts to re-build the south following america's civil war. radical republicans wanted to punish the south for starting the war. they also wanted to be sure new governments in the southern states would support the republican party.