Aside from the obvious
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Since states can still allow abortions, this means that a lot liberals will fuck off right back to their blue states (God-willing).
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It's not enough for states to ban abortions, though; they must criminalize it, because people are already talking about driving over state lines, getting an abortion, and then coming right back. Criminalizing it means that the person will be wanted in that state, and at the very least, cannot return. This should help make it that liberals MOVE out of red states altogether.
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Men and women will be more conscious about having unprotected sex. Hopefully, they'll look for serious relationships that will lead to marriage (won't hold my breath, though). Overall, it should lead to less degeneracy.
It's against US law to travel to another country with the goal of violating US law. Sex tourism, for example, is illegal for US citizens overseas simply because it's illegal here.
Surely traveling across state lines with the explicit purpose to murder a child, in violation of your home state's laws, should be similarly punished.
I wonder if I should get a database job working for Planned Parenthood and "leak" interstate murder rings to their home states...