The document examines the reasons for the growth of railroads in the US, the problems in building them, and their overall impact. It discusses how the Pacific Railways Act of 1862 established companies to link the east and west coasts, which were completed in 1869. Building the railroads presented financial and logistical challenges like acquiring funds, navigating difficult terrain, and dealing with native groups. The railroads created jobs, spurred related industries, opened new markets, and allowed for faster travel and settlement of the west, though they also displaced native lands and hunting grounds.