Actually, the states have powers under "providing for the general welfare" and the Feds have none. Feds get their power from having the ever expanding powers to regulate commerce and give away their money and by their money, the Court really means our money. For example, the Feds can't force states to limit drinking to 21, but they can take away almost all highway funding if a state doesn't comply. The Feds can also regulate how much food you grow in your garden because if everyone in Michigan had a garden, it COULD affect the price of produce in California so it "affects interstate commerce".
And this has not existed for 200 years. This interpretation only came into existance after FDR got upset that the US Supreme Court repeatedly ruled the US Consitution prohibited the Fed's from implementing the New Deal. It only came into existance after he threatened to expand the Court so it would be comprised of dozens of Justices who believed we had been "misinterpreting" our Constitution all along. Now, you can understand the difference between strict constructionalists and judicial activists.
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