The Western Frontier

Eyewitness to History: The Old West (primary documents)
http://www.eyewitnesstohistory.com/owfrm.htm

California as I Saw It (1849-1900)  - (primary documents)
http://lcweb2.loc.gov/ammem/cbhtml/cbhome.html

New Perspectives on the West - PBS
http://www.pbs.org/weta/thewest/index_cont.htm

American Memory: History of the American West (primary documents)
http://memory.loc.gov/ammem/award97/codhtml/hawphome.html

The Homestead Act
http://www.pbs.org/weta/thewest/resources/archives/five/homestd.htm

The Growth of Industry

Railroads

American Memory: History of Railroads and Maps
http://memory.loc.gov/ammem/gmdhtml/rrhtml/rrintro.html

The Iron Horse: The Impact of the Railroads on 19th Century American Society
http://odur.let.rug.nl/~usa/E/ironhorse/ironhorse11.htm

California State Railroad Museum
http://www.csrmf.org/doc.asp?id=77

Chinese American Contribution to Transcontinental Railroad
http://cprr.org/Museum/Chinese.html

Inventions

19th Century Inventions - 1851-1899
http://inventors.about.com/library/weekly/aa111100b.htm

Inventors and Inventions from 1851-1900
http://www.enchantedlearning.com/inventors/1800b.shtml

Lighting a Revolution: A Nineteenth Century Invention Factory (Thomas Edison)
http://americanhistory.si.edu/lighting/19thcent/hall19.htm

The Great Idea Finder : Nineteenth Century Innovation Timeline
http://www.ideafinder.com/history/timeline/the1800s.htm

Distinguished Women of Past and Present : Invention
http://www.distinguishedwomen.com/subject/invention.html

19th Century Invention and Science (list of links)
http://www.teacheroz.com/19thcent.htm#women

About: Inventors
http://inventors.about.com/

Big Business

The Gilded Age  1866-1901
http://www.carnegielibrary.org/subject/history/gilded.html

The History Place : Child Labor in America 1908-1912
http://www.historyplace.com/unitedstates/childlabor/

The Pullman Strike : Chicago: 1894
http://www.historyplace.com/unitedstates/childlabor/

The Richest Man in the World : Andrew Carnegie
http://www.pbs.org/wgbh/amex/carnegie/

The United States Strike Commission : The Pullman Strike : It's Causes and Events
http://www.museum.state.il.us/exhibits/athome/1850/voices/curtis/strike.htm

Historic Pullman Foundation (list of links)
http://www.pullmanil.org/links.htm

Urban America - Immigration

The Urbanization of America 
http://www.ecb.org/tracks/mod9.htm

American Memory : Rise of Industrial America : City Life in the Late 19th Century (primary documents)
http://memory.loc.gov/learn/features/timeline/riseind/city/city.html

Ellis Island
http://www.ellisisland.com/

Ellis Island : Passenger Search
http://ellisisland.org/

Rediscovering New York : NY State Archives
http://www.rny.nysed.gov/rindex.shtml

Why Germans Left Home
http://www.ulib.iupui.edu/kade/adams/chap2.html

The Making of a Melting Pot (Irish Immigration)
http://www.ailf.org/ipc/policy_reports_2001_Irish2.asp

American Memory Italian Immigration (primary documents)
http://memory.loc.gov/learn/features/immig/alt/italian9.html

The Peopling of America (Immigration Timeline)
http://ellisislandrecords.org/immexp/wseix_4_3.asp?

American Memory : Rise of Industrial America, 1876-1900: Immigration to the United States 1851-1900 (primary documents)
http://memory.loc.gov/learn/features/timeline/riseind/immgnts/immgrnts.html

American Memory : Rise of Industrial America, 1876-1900 : Chinese Immigration to the United States : 1851 - 1900 (primary documents)
http://lcweb2.loc.gov/ammem/ndlpedu/features/timeline/riseind/chinimms/chinimms.html

Immigration to the United States 1789-1930
http://ocp.hul.harvard.edu/immigration/

Tenement Museum
http://www.thirteen.org/tenement/logcabin.html