Explanation/answer:
9th:
gives a ton of freedom to the people basically saying that they have the freedom to retain the rights even though they were not specifically discussed in the bill of rights, this limits the power of the government because it gives the people more power
10th:
Lets the states impose their own laws special to those states. having its own law would let the state become nearly as powerful as the federal government, so that takes away power from the federal government.
Honestly, it's good that the federal government doesn't have all the power otherwise it would be kinda like a dictatorship.