Writing about instability and eventual civil war

I have no idea how to show instability in my novel
Or rather, I have no idea how to show it in a good way. While I may know about what could cause instability like, heavy taxation, no representation in the government, cultural differences, loyalty to the home region, poor quality of life, a lack of citizenship for some people, too many poor people, bad communication, lack of resources, lack of trade, some people not being allowed to take part of commerce, racism towards different (fantasy) races, different religions, too many legitimate heirs to the throne, no heirs to the throne, no common national identity, too many slaves, economic instability, easy access to knowledge, bad propaganda, and one hundred other things I don't have the time to mention.

My point is, I know all these things, but I do not know how to show them effectively in my story. My two POV characters live two very different lives. One is a monster slayer in training that lives in the cold and desolate, but proud, north. The other is a slave living in the rich and beautiful, but oppressive south. In the middle of this southern territory and northern territory, we have the capital and its surrounding land. While my monster slayer would travel around in the north to bring some sort of relief to the villages would my other POV character remain in the same city throughout the whole story.

While I could show instability to my northern character through seeing broken infrastructure, poor people, heavy taxation, and the upper class owning all the north's resources I don't know how I would do it well. The instability should be in the background, noticeable but not in plain sight. The climax of the story will show both the north and south rebelling, with the instability throughout the book has set up these thoughts of revolting against their king or masters. I just wish I knew the best way to subtly or at all show off these themes and events since they are the most important part of the external conflict.