Define the three categories of people living in the united states

If you refer to social classes the answer is:

The American Social Class system is divided into three layers:

Upper Class; Middle Class and Lower Class and are based on socioeconomic conditions.

Citizens by birth - Being born in the United States

Naturalized Citizens - Having to live in the state for a very long period of time

Noncitizens - Not a legal member of the state

the doctrine of nullification recommended that states living inside the union have the one-sided, inalienable ideal to void any law made by the national government that could be esteemed illegal.

the united states was shaped based on a general agreement among its individual states. hence, it is inferred that under the hypothesis of invalidation, since the states are the establishment of the union, they have the ability to referee and disprove unlawful laws.

i think the answer is the one about environmental and social health.

hope this