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Not every law, but there are some policies that create bad situation when they are illegal in some states but not others. Historical examples are slavery, prohibition, voting rights, marriage equality, and abortion.
Slavery being legal in some states but not others led to the Civil War, prohibition led to mob wars, etc. States still have the power to legislate within the law, but setting federal limits is sometimes necessary so the States can remain United.
Lukewarm, chilly…