All the Little Tribal Wars

Civilly

Lieutenant George Armstrong Custer (R) with former classmate, friend, and captured Confederate soldier, Lieutenant James Barroll Washington.

Just making a list and checking it twice.

Black vs. White 

Black vs. Hispanic 

Black vs. Asian 

Liberal vs. conservative 

Women vs. Men 

Straight vs. gay 

Lesbian vs. Trans 

Pro-Life vs. pro-choice 

Black American (ADOS) vs. Black African and Caribbean (FBA)

US citizen vs. Illegal alien 

Pro-mask vs. Anti-mask 

Pro-COVID vaccine vs. anti-COVID vaccine 

Christian vs. Muslim

Religious vs. atheist

Jew vs. everyone

Politician vs. citizen

Feel free to drop any others in the comments and I’ll add them.