SLIDESHARE is a ridiculously useful site for teachers in all subjects – – – and lends itself particularly well to Social Studies.
Educators from around the globe have basically contributed thousands of presentations on basically every major topic that comes up in standard social studies curriculum. QUALITY CONTROL is the KEY. It just takes a bit of your time to enact quality control, and screen the presentations for relevancy to grade level. Enjoy – – this one is a SERIOUS time saver.