Assertion: railroad | /r/AtLocation | america
Facets:
Source sentences:
text: Railroads in U.S. History (1830–2010) (2010), set of 4 DVDs, directed by Ron Meyer; #1, "Railroads come to America (1830–1840);" #2, "The First Great Railroad Boom (1841– 1860)"; #3, "A New Era in American Railroading (1861–1870)," #4, "The Second Great Railroad Boom (1871–2010)" further information