The Rithmatist series is set on an Earth where the North American continent has been fractured into a large number of islands known as the United Isles of America. Sometime in the far past, the JoSeun people (who parallel the Korean people of our world), took over much of Europe.  In the history of the Rithmatist, the Mongols were turned to work for the JoSeun empire. It borrows elements of a "steampunk" setting, incorporating springworks, a version of early industrial revolutionary technology but with more versatile applications.
- United Isles of America
- Collection of north American island states
- Presumably the alternate Great Britain
- Presumably the alternate France
- Presumably the alternate Spain
- Presumably an alternate North Africa/Egypt
- An Asian empire
- Aztek Federation
- South American nation
Sometime in the far past, the JoSeun people, which are parallel to the Korean people of our world, took over much of Europe. In the history of the Rithmatist, the Mongols were turned to work for the JoSeun empire. The conquest of the Americas by European imperialism seems to have foundered enough that the Aztek Federation is still a power in southern America.