Beginning in 1849, tens of thousands of Americans packed their bags and headed West, in search of gold. 30 years later, the U.S. had 13 more states, 160,000 more miles of railroad track, and almost 40 million more people. It had suffered the most bloody and tragic of wars -- a civil war. And it had wiped out entire populations of Native Americans. In this poignant and compelling chapter of The American Story, you'll experience the powerful drama of that transformation, in the words of the people who were there.