Respuesta :
Below are the choices and the one with x mark is the answer:
allowing slaves to vote.
[X] building a transcontinental railroad.
letting popular sovereignty take its course.
ceding land back to Mexico.
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allowing slaves to vote.
[X] building a transcontinental railroad.
letting popular sovereignty take its course.
ceding land back to Mexico.
Thank you for posting your question here at brainly. I hope the answer will help you. Feel free to ask more questions.
Correct answer:
Building a transcontinental railroad
An engineer named Theodore Judah had the idea of building a railroad through the Sierra Nevada mountains. Judah had recruited a group of investors in Sacramento to form the Central Pacific Railroad Company. This idea was presented in Congress and President Abraham Lincoln who promulgated the Pacific Railroad Law.