I made these several years ago using impress.js and a lot of time that I don't have any more. You are welcome to use these as you see fit.
George Washington & John Adams: The First Election Presentation
This one was designed for 8th graders, and it covers the basics of the first successful presidential election in the United States.
Dark Side of the 1920s Presentation
I built this for an AP US History (APUSH) class that had extra time during their 1920s unit, and they voted on this. It talks about Corruption, Crime, Racism/Xenophobia, and Communism in the 1920s.
I made this for a sophomore honors level English class that needed a primer on Communism. It covers the basics and offers a beard score for each of communism's early, important figures.
Vietnam War Presentation
This is aimed at a junior level US History class. It covers both the reasons for the war and the subsequent costs. Note that none of my presentations advances any particular viewpoint, but does cover the major ones that existed at the time.