NPS Website on Louisiana Purchase US Department of State website Early America website
SPANISH AMERICAN WAR PBS website Fort Scott website U.S.-American Ware website Annexation of Texas
COLORADO GOLD RUSH Mining Bureau Gold belt Byway State of Colorado website
TRANSCONTINENTAL RAILROAD PBS Transcontinental Railroad website State of Colorado History for Kids Denver.gov website
SAND CREEK AND MEEKER MASSACRES Colorado History Sand Creek Massacre website Survey of Historical Sites and Buildings
SHERMAN SILVER PURCHASE ACT AND REPEAL Factmonster website Molly Brown website Ellen's Place website
LUDLOW MASSACRE The Ludlow Massacre on PBS website Ludlow Massacre Library.com