Anything by Ken Burns, Absofuckinglutely!
I like his 'Baseball' and 'Jazz' quite a bit.
'The Untold History of the US' by Oliver Stone. It's not bullshit like his 'JFK', it's one of the finest history docs you'll ever see. Probably his finest hour (or actually 10 hrs.)
It was a 10 part series originally on Showtime covering 1929-2011. Just the old movie news reels alone make it cool.
And I guarantee you'll learn something.
Available on Netflix and YT.
I like history a lot, especially that time period where you have movies of it.
It should be required viewing in public schools.