You should by by the one that is not a true fact, or does not make sense.
Hope that this would help you! =)
Kansas was called "bleeding Kansas' because when the territory was formed, the state got to choose whether it would be a "slave state" or a "free state", and so the people on both sides went around killing each other. The most famous person of this period was John brown, who violently killed at least 12 people because they supported Kansas becoming a slave state.
One of the most infamous of these political machines was Tammany Hall, the Democratic Party machine that played a major role in controlling New York City and New York politics and helping immigrants, most notably the Irish, rise up in American politics from the 1790s to the 1960s.
Union Pacific was responsible for the building of the rail lines from Kansas westward.
The Central pacific hired mostly Chinese immigrants to lay its lines. They also used their valuable knowledge of dynamite to help blast through the Rockies.
The railroad lines met at promontory point, Utah. Most of the line had been laid by the Union Pacific, but the Central Pacific had a much harder time getting through the mountains.
