History Campaigns Cherokee Indians Clothing factories Concord, Battle of, Concord, Mass., 1775 Fire, 1911 Five Civilized Tribes Indians of North America Industrial safety Labor laws and legislation Lexington, Battle of, Lexington, Mass., 1775 Pacific railroads Railroads Relocation Safety measures September 11 Terrorist Attacks, 2001 Space flight to the moon Terrorism Trail of Tears, 1838