Well, if they are not subject to any government, then it's can't be a government?
But I think you're looking for a word to describe this, a good word would be "anarchy" or "anarchists"
another one would be "stateless" - if those people don't have any citizenship, they'd be stateless.
<span> person who flees for refuge or safety, especially to a foreign country, as in time of political upheaval, war, etc.</span>
The founding fathers wrote the Constitution which is the blueprint to the government.
The one that could affect human population would be :
A. Deadly virus emerges that can pass from human to human.
This will greatly decrease the amount of human population
C. Nuclear war breaks out between two nations
This will kill a lot of people and also potentially creating genetic mutations for the next generation
D. Immigration to united states from china increases
This will make it harder for the population to get the resources that they need for their living
hope this helps