Uncharted : Lewis and Clark in Arcane America
(Book)

After Halley's Comet was destroyed in a magical battle in 1759, the backlash separated the entire New World from the Old in an event known as The Sundering. In America, magic works. It is 1803, and Meriwether Lewis is attending a talk by Benjamin Franklin when it is disrupted by the attack of a winged fire-breathing beast. Franklin tells Lewis of a great, growing evil that lurks in the uncharted Arcane Territories west of the Mississippi, and commissions Lewis and William Clark to embark on a remarkable voyage of exploration, to meet and document the indigenous tribes, to find a route all the way to the Pacific Ocean-- and stop the growing evil that is filling the American West. -- adapted from jacket.