This system of government has one central government that makes all the decisions
with little to no involvement of smaller governments?

Can you please answer this question

A confederation.

Explanation:

A confederation is the union of various states that unite for a specific purpose and delegate the powder to a central government. Confederations are often created in critical situations to make faster decisions intergovernmental.

For example, in America, the original 13 states signed the "Articles of Confederation" which are considered the first constitution of the republic, it was created to unite the 13 states and claim independence from England.

I hope this information can help you.

necessary and proper clause. the congress shall have power to all laws which shall be necessary and proper for carrying into execution the foregoing powers, and all other powers vested by this constitution in the government of the united states, or in any department or officer thereof.

they bring people together to achieve control of the government

basically choosinng what sets in   congress and presdicny this is to keepthe antion hole and so it can last because wiht out authority it wouldnt last a week