I recently came across this new site called American History in Video.
American History in Video provides the largest and richest collection of video available online for the study of American history, with 2,000 hours and more than 5,000 titles on completion. The collection allows students and researchers to analyze historical events, and the presentation of historical events over time, through commercial and governmental newsreels, archival footage, public affairs footage, and important documentaries. This release includes over 1260 titles, equaling approximately 420 hours.
This is a great resource for American History. Enjoy!