Sorry, you have got it backwards. The 9th Amendment says:
The powers not delegated to the United States by the Constitution, nor prohibited by it to the States, are reserved to the States respectively, or to the people.
So as far as the federal government is concerned, they don't have such power unless it is enumerated. So now perhaps you would quote the part of the Constitution that does this...
Consider:
The Congress shall have Power To lay and collect Taxes, Duties, Imposts and Excises, to pay the Debts and provide for the common Defence and general Welfare of the United States...
Then consider the social unrest caused by high unemployment and poverty during the depression.