From website:
Northern Crown is a campaign world set in North America's legendary past, in an age of frontier adventure, political intrigue, and supernatural horror. Inspired by history and infused with myth, it is a place where heroes fight for freedom, chart a vast wilderness, and battle unknown evils.
Visit Northern Crown with the New World Adventures campaign book, which details the cultures, classes, combat techniques, equipment, spells, psionic knacks, and invention creation rules that will get players started.
Explore further with the Gazetteer, which delves deep into the lands of Northern Crown with descriptions of the people, place, monsters, hazards, magic items, and inventions that will flesh our your campaign. From intrigue and rumors, to information on secret societies, the Gazetteer takes you into the heart of Northern Crown.