Answer:
By limiting the amount of power that the local government has.
Step-by-step explanation:
This question relates to a factor in the law called, "checks and balances." This is how each part of the government is allowed to "check" other people or organizations in the government to prevent anyone from becoming too powerful.
The theory of states' rights allows states to do things like make laws, vote, and do other actions that are not in the full control of the government, or the federal government, specifically.
Hope this helps you out! :)