What important part of federalism does the 10th amendment to set up?

The Tenth Amendment underscores the principle that the national government is one of limited, enumerated powers, and does not have the authority to exceed those powers. The Constitution makes clear that the states and the people are the ultimate residuary of all powers not specifically delegated to the federal government. hope this helps you (:

Constitution's clearest endorsement of federalism

productive most commonly means: achieving or producing a significant amount or result.

explanation:

productive can also mean:

producing or giving rise torelating to or engaged in the production of goods, crops, or other commodities.

these depend on how the word productive is used. most likely productive will mean   achieving or producing a significant amount or result.