What was the most important reason for building the transcontinental railroad?

What was the most important reason for building the transcontinental railroad? The railroad would make travel across the continent much faster, easier, and safer. Which statement about the journey across the American continent in a covered wagon in the early 1800s is accurate?

On april 20, 1814, the dethroned emperor left france for the isle of  elba, where he was exiled under the terms of the treaty of fontainebleau.napoleon  would be allowed to ruleelba, which had 12,000 inhabitants. perhaps cruelly, the treaty allowed him to retain the title "emperor."