Jeff sent this link which contains over one hundred short videos on US History topics. Some of these videos might be appropriate to supplement our courses and could be used in a "flipped teaching" scenario, where students view the videos at night in preparation for class room activities the next day.
I've created a web page for my EL US History class which contains presentations, worksheets, reading guides and activities for my EL students. Students can access the web page if they are absent or during the class period for various activities.