Even state statutes against murder are subject to the Constitution as is evident by the ability to appeal convictions in federal courts.
The fifth amendment to the U.S. Constitution prevents individuals from being deprived of life, liberty, or property without "due process of law. Do you think this Constitutional right should be left to the states to protect?
What about other Constitutional rights like those in the First or Second Amendments? Should we leave it to the states to determine if we should have the right to free speech or to possess firearms?
The right to life is a fundamental right explicitly protected by the U.S. Constitution. All state laws must be in accord.
There’s not enough consensus for a Constitutional amendment pertaining to abortion.