Question

A ________ is a system of government in which member states retain almost all of their sovereign authority and delegate limited powers to a weak central body.

Answer 1

The answer to this question is confederation
In confederation system, the states will have the freedom to choose whatever regulations they want without any federal government that could restrict them.
Even though this may make problem-solving process on states level become a lot faster, this will increase the risk of the country became divided/separated.