I think is was a Netflix or Amazon series. The opening scene Trump wins the election then the next shot is a Trump supporter extremely happy, then to the next shot Trump haters crying. Not a documentary.
Abba Answered question Jul 26, 2022
Could this be American Horror Story: Cult ?
The first episode starts very similarly to your description
Here is a trailer,
Filmfind Changed status to publish Aug 5, 2022