Posse

Soldiers return from war with stash of gold and seek vengeance on a pre-war lynch mob.

...about an American West that was populated not just by white cowboys, but also by blacks, who rode the range, were lawmen and outlaws, and ruled themselves in their own black townships

What's most remarkable about POSSE is how desperately conventional it is beneath its black skin, and nowhere is this more apparent than in the character of Lee, played by director Van Peebles.