PBS
Pbs: American Experience: The Richest Man in the World: Meet Andrew Carnegie
PBS provides this five-part, thorough biography of one of the richest men in America, Andrew Carnegie.
Gilder Lehrman Institute of American History
Gilder Lehrman Institute: Immigration and Migration
[Free Registration/Login Required] A lengthy essay discussing the differing opinions about immigration and the role of immigrants in the United States in the latter half of the 19th century and the early 20th century. Find out about the...
Pennsylvania Historical and Museum Comission
Explore Pa History: The Great Steel Strike of 1919 Historical Marker
A strike by steel workers in Chicago eventually spread across the United States in 1919. Read about the strike, how was involved, and how the employers turned popular opinion against the strikers.