The document discusses the growth of railroads in the United States during the late 1800s and early 1900s. Railroads helped the country by enabling the transport of passengers and goods across long distances, facilitating Western expansion and the growth of cities. However, their rapid growth also led to corruption and required government regulation. The first transcontinental railroad connecting the Central Pacific and Union Pacific railroads was completed in 1869, though the work was dangerous and costly in lives.