According to the Tenth Amendment, "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."
In other words, let the states run their own way. The Federal Government needs to represent the States, Not try to Control them. That is why abortion is legal in some states and not in others. That is why Roe v. Wade was such a big deal. It was a case stating that the federal government could not pass all laws onto the states.