PBS has some great broadcasting for television, but did you know they also great broadcasting online? PBS Learning Media is an outstanding resource for videos, images, interactive elements, webinars, virtual field trips and much more.
On the site you will find "This Day in History" and it shares videos for various subject areas. For example, you might find information about the 100th day of school for math or a video about Mark Twain for English.
Just create a free account and start your search. You can search by grade level, subject area, and content type. Save what you find to favorites. I encourage you to explore everything this website has to offer.