If you missed Part 3: “American Impressionists and the Gilded Age”, 

you can view it here:  https://youtu.be/fiZfu_Av-CE

If you missed Part 1: “Colonial America and the Art of the West”, you can view it here:   https://www.youtHere’be.com/watch?v=aK9fYf-t2iA
If you missed Part 2: “A Nation Divided, A Nation Restored”, you can view it here:  https://www.youtube.com/watch?v=XhC3E7sE-Ho