In the year 2015 North Korea attacked America with their most powerful weapon Element D. The calculations stated it had a 98% chance of complete success. The 2% happened. The world was left to rubble and only about 10% of people survived. The remaining 700m were scattered about the earth at the time gathered to the American Continent, as the Eurasian ones were infertile. People relied on a new industrial revolution to take care of their needs, at the top of the world were those known to everyone as the Mad Scientist's. Those of incredible ability, a new Elite that outdid those with physical ability. Most of them were, indeed, mad, brilliant, but mad. It was like a new caste system, at the top sat the Mad Scientist's, below them, the Hunter's, those of excellent physical strength and dexterity who protected and brought meat and new vegetation to the new Eden. Third, the Acrobats, those of flexibility, quick wit, and knowledge of the hideouts, they prefer heights and make excellent lookouts for the wildlife affected by radiation, monsters that kill on sight. Fourth, the Farmer's, a secret powerhouse that provided the new Eden with food. Fifth, The Con's, quick to the point, slippery, and always making a quick buck, they are among a sub division, but are known for their ability to have important information. Sixth, and final, The Worms, not that they were by any means filthy, they simply had no role in the other castes. All these people gather under the rule of one King, a cruel ruler, taxing the people of Eden highly, regardless of caste. The laws simple: Do not murder, do not steal, do not plot the king's death, do not disturb the peace, do not engage in public 'indecencies', do not engage in homosexual activity.
And thus the stage is set.