National History Day: History of NHD (2) tv-14 Play video Select your TV provider to log in to have full access to videos Select your TV provider See all providers Don't see your TV provider? Learn more You can access this video on the free HISTORY® app. *You must verify your TV provider towatch this video on the App Your Parental Control settings do not allow you to view this content. National History Day: History of NHD (2 min) tv-14 What is National History Day? The history channel shows you what the holiday is and where it came from.