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American Memory provides free and open access through the Internet to written and spoken words, sound recordings, still and moving images, prints, maps, and sheet music that document the American experience.
"The Colorado Historic Newspapers Collection (CHNC) currently includes more than 500,000 digitized pages, representing 163 individual newspaper titles published in Colorado from 1859 to 1923. Due to copyright restrictions, CHNC does not generally include newspapers published after 1923."(source: CHNC website)
Be prepared to utilize information in multiple formats. The best sources for your topic may not be digitized or available online. You may need to use books, microfilm, microfiche or archived documents.