I believe our gov was structured so that most issues pertaining to daily life was covered under State law specifically in order to get the States competing for our business/citizenship. With the States competing we ultimately should end up with improved governments overall at the State level.
So, basically with States we have the freedom to choose among many different options. With law at the federal level we do not have that same freedom to choose, since no matter where we go in the nation the federal laws (as long as they are constitutional) apply.
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