A post-apocalyptic Earth where all the countries are united as one

Science fiction, maybe fantasy

After the Third World War, the countries of Earth decided to unite as one to attempt to prevent more wars. All countries are now one, massive supercountry known as Pangea. All the former countries are now states, with a similar ruling system to the United States in that each state has its own little government but also has to follow the whole nation's government as well.

The same laws as Earth, since this is just futuristic Earth.

No magic exists, though there is some very advanced tech that could make you wonder.

Very advanced, especially in the communication department.

The social pyramid in Pangea is sorted by job. Here is the Pangea social pyramid from highest to lowest.

1: King or Queen
2: High nobles
3: Prince or Princess
4: Low nobles
5: Palace workers
6: Average/middle-class workers
7: Maids or servants
8: Factory workers or laborers

While it is possible to change classes (through marriage, promotion/demotion by a 3 or higher, or adoption), it's rare to move up to anything beyond a 5. When marriage is involved, the wife always marries up/down to the husband's job and social class.
Most people in Pangea are 6.