I disagree. Anyone who thinks each state will end abortion unilaterally is not being realistic. States like Massachusetts will never end abortion on their own, if the federal government just washes their hands of the issue and leaves it entirely up to the states. We tried "sending it back to the states" when this country was divided on slavery and didn't work. There should be a federal amendment abolishing a "right" to an abortion throughout the nation, as was used to end slavery. The right to life is guaranteed to ALL Americans in the constitution, it's not a "state issue" anymore than states have the "right" to decide on their own whether they will allow trial by jury or a right to bear arms. Those rights were guaranteed to all Americans regardless of what state they live in.
Congress had the right to ban slavery because slavery is mentioned in the Constitution. Article I, Section 2 states that slaves were counted as 3/5 of a person, in determining the number of congressmen that the states would receive. However, abortion isn’t mentioned in the Constitution. The Declaration of Independence states that all people “are endowed by their Creator with certain unalienable Rights, that among these are Life, Liberty, and the Pursuit of Happiness.” No state can deny a trial by jury of a right to bear arms, because those rights are mentioned, in the Constitution. However, the Constitution doesn’t mention a right to life.