Answer:
The group that could best be described as states' rights advocates would be that of the Anti-Federalists.
Explanation:
- The Anti-Federalists were the ones who opposed the "idea of a federal government" with more powers bestowed into the hands of the central government.
- They argued that the population of the states should get to decide for themselves what is right for them and the central government should not get to exercise the powers the 'restrict the states from doing anything' or direct the states to do something.