The queen of dreams and stars

After WWIII the world falls apart and becomes the apocalypse. Now in just the United States alone cities have been torn apart and people rise and create their own governments.

Astara, the young daughter of a king gets sold to a neighboring kingdom after her mother dies. She gets raised into a beautiful young woman and ends up marrying the prince of her new kingdom and together they team up to take down her maniacal father.
*authors note* there will still be modern technology since this is post apocalypse