Who made sure that a transcontinental railroad would be built?

The person who made sure that a transcontinental railroad would be built is Abraham Lincoln, who, during his presidential term, encouraged Congress to pass the Pacific Railroad Act in 1862.

Explanation:

The Transcontinental Railroad was built between 1863 and 1869 and was the first railroad to cross North America. The railroad was 3069 kilometers long, stretching from Sacramento in the west to Omaha in the east, and was built by two companies, the Central Pacific Railroad and the Union Pacific Railroad, which built their parts from each end of the continent.  

The project was initiated by the engineer Theodore Judah, who traveled to Washington, D.C. in 1861 to present his idea to the Senate and President Abraham Lincoln. The proposal was approved and on July 1, 1862, and the Pacific Railroad Act was passed, which mandated the construction of the railway for the two companies.

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step-by-step explanation:

look at the x and y axis