In my steampunk series, The Blackburn Chronicles, a disaster fractures all of America, sends California into the ocean, and blocks off the north leaving the country in a shambles.
Powerful governors of the remaining states merged under giant electric Tesla Domes to create super territories. As a result, American rose from the quakes as The Peaceful Union, which was anything but peaceful.
Ruthless governors, created a new government. One with no central seat of power to avoid losing the President as they had in the Great Calamity. Each dome is like a separate country unto itself with its own specialty. Giant agri-factories grow what few kinds of vegetation that are left.
Some city-states control the coal factories that fuel the massive steam engines running the domes. Others house cities repaired with metal façades which house the precious remnants of culture, music, and art. The frozen territories of the north keep terrible secrets locked behind icy fortress walls.
All of this was so fun to imagine, but challenging to get across to readers. However, a wonderful artist sent me this map of the Thirteen City-States of the Peaceful Union bringing The Tremblers that much more to life for me.
If you're interested in finding out more, take a look at the free novellas which offer a peek at the dangerous world of The Blackburn Chronicles.