Which level of government is responsible for the admission of
new states into the United States of
America?
A. Federal Government
B. State Government
C. concurrent power

Explanation:

Article IV section 3 of the constitution mandates congress to vote on how a new state is to be formed. I do not know the exact terms of how a state is created as a sovereign body, but I suspect any new state would have to go through what Hawaii and Alaska went. These were territories that were not carved out of an existing state so the problem was not complicated by two states feuding over where the boundary would be.

Recently Puerto Rico had a non binding referendum on this very question. I don't know what was decided.

It's the Federal Government in the form of congress. The territory has to be in favor of statehood.

the installment plan of the 1920s, an arrangement that allowed people to buy what they wanted with a small down payment and pay off the rest in monthly installments, provided americans a way to own what they did not have the money to buy.