The Corpus of American Historical English is a searchable index of word usage in American printed material from 1810 to 2009. Powerful complex searches allow you to trace the appearance and evolution of words and phrases and even specific grammatical constructions, see trends in frequency, and plenty more. Start with the 5-Minute Tour.
The American Festivals Project takes you along on two guys' National Geographic-funded 2008 tour of the "small, hidden, and bizarre" festivals celebrated all over the United States. Through photos, video, and a blog, discover Rattlesnake Roundup, Okie noodling, an American Fasnacht, the Idiotarod, and plenty more. [more inside]
Engineering Perfect Americans Were your immigrant ancestors considered genetically predisposed to become criminals? Were your mixed-ethnic ancestors thought to be polluting the nation's 'germ-plasm'? The Image Archive on the American Eugenics Movement presents a well-put-together online exhibit/walkthrough of this disturbing vein in American history.