I

Each level of government has its own responsibilities, though some are shared. Which of the following actions is only for the national government?

Collecting taxes
Enforcing laws
Conducting elections
Establishing post offices

D. Establishing post offices

Explanation:

Governments don't conduct elections that is something else I forgot. Police make sure people follow laws and lawyers. I forgot who collects taxes but the government does post offices so nothing bad comes in or out of the U.S.A because He/She is also in charge of our safeness.

sorry if I got wrong grammer or something wrong please correct me I like to learn.

the lowest among the social higher rank were the working class. this class remained detached to the political progression   of the country and was hostile to the other two classes

c it says nothing about connecting those 2 seas.