What other great cultural gifts can America be credited for?
Surely you jest.
As a start check out American Treasures of the Library of Congress (and the galleries for Memory, Reason and Imagination):
http://www.loc.gov/exhibits/treasures/
Meet amazing Americans:
http://www.americaslibrary.gov/cgi-bin/page.cgi/aa
Great Engineering Acheivements of the 20th Century:
http://www.greatachievements.org/
Smithsonian:
http://www.si.edu/
The Metropolitan Museum of Art:
http://www.metmuseum.org/home.asp
NASA:
http://www.nasa.gov/home/index.html