Even ethno-nationalism isn't quite right. After all, my country split off along ethnic and linguistic lines, based on explicit justifications that the land belongs to our 'kin'. But all without any appeals to supremacy, national or ethnic (at least, such appeals didn't have much traction), and other ethnic groups living here were granted citizenship just like everyone else, and even special representation by guaranteed seats for minority groups in parliament.

What you're describing could maybe be called ethnic hate/supremacism?