Library of Congress Prime Sources: http://www.loc.gov/search/?q=20th+century
Multnomah County Library in Washington State has developed a great American History site with lots of links. Click on the correct topic and it will take you to a web site. http://www.multcolib.org/homework/amhsthc.html
DMOZ is the largest, most comprehensive human-edited directory of the Web. It is constructed and maintained by a passionate, global community of volunteers editors. It was historically known as the Open Directory Project (ODP).
About.com has a directory listing of U.S. History, by decade. http://history1900s.about.com/library/weekly/aa110900a.htm
America at the Turn of the Century: A Look at the Historical Context. http://memory.loc.gov/ammem/papr/sfamcen.html
Eye Witness to History. http://www.eyewitnesstohistory.com/20frm.htm
American memory at the Library of Congress: http://memory.loc.gov/ammem/wtc/wtchome.html
The Library of Congress, American Memory Division has pulled together a great site for the turn of the century. The World's Transportation Commission Photograph Collection contains nearly nine hundred images by American photographer William Henry Jackson. In addition to railroads,elephants, camels, horses, sleds and sleighs, sedan chairs, rickshaws, and other types of transportation, Jackson photographed city views, street and harbor scenes, landscapes, local inhabitants, and Commission members as they traveled through North Africa, Asia, Australia, and Oceania.
The general index to the “American Memory” collection is at: http://memory.loc.gov/ammem/collections/finder.html
Organized Labor. http://www.ushistory.org/us/37.asp
The Ram's Horn was published in Chicago, Illinois during the 1890s and the early years of the twentieth century by Frederick L. Chapman & Company. http://ehistory.osu.edu/osu/mmh/Rams_Horn/
Sports at the turn of the century: Hickock’s Sports History. http://www.hickoksports.com/history/histbit1.shtml
Harper’s Weekly ads. http://advertising.harpweek.com/
EAA - Emergence of Advertising in America: 1850 - 1920
The Emergence of Advertising in America: 1850 - 1920 (EAA) presents over 9,000 images, with database information, relating to the early history of advertising. Click on either of the tabs labeled “company”, “product”, or “date” Then the category found below on the page. This may take a while to load.
There is a timeline of advertising at http://scriptorium.lib.duke.edu/eaa/browse.html “browse this Collection” and then the “Genre” tab for actual advertising artwork
Children’s games at the turn of the century. http://www.emporia.edu/cgps/tales/m95tales.htm
Games and Toys at the Turn of the Century: Dolls, Flying Jennys and Circle-Four-To-Rowser http://thelibrary.springfield.missouri.org/lochist/periodicals/wrv/v1/n5/f62f.htm
The Library of Congress has put together a listing of The American Variety Stage: Vaudeville and popular entertainment 1870- 1920. Click on the six major links to find actual posters, billboards, scripts and artifacts from that time period. http://memory.loc.gov/ammem/vshtml/vshome.html