“The powers delegated by the proposed Constitution to the federal government are few and defined. Those which are to remain in the State governments are numerous and indefinite.”

In 1932, he wrote, “It is one of the happy incidents of the federal system that a single courageous State may, if its citizens choose, serve as a laboratory; and try novel social and economic experiments without risk to the rest of the country.”

The Bill of Rights is about the scope of government. It limits not what we can do, but what government can do. And the Tenth Amendment is very specific; whatever powers aren’t granted to the federal government in the Constitution itself are reserved for the states, or for the citizens.