Abortion is not a constitutional right. You keep falsely asserting that. Even if it were, I"m not even arguing on the grounds of legality, but of ethics and morality. If you're dealing with the question of murder it's not a "civic" question, it's one of the most fundamental ethics of humanity...don't murder other humans.
Laws are civic constructs. They are there to ensure the efficient and effective functioning of civilization.
Separation of church and state First Amendment. "Congress shall make no law respecting an establishment of religion, or prohibiting the free exercise thereof."
You don't legislate morality, you educate morality.
You want to prevent abortions? Encourage girls and women to go to school, practice safe sex, and to use birth control.
You want to teach them your religious beliefs? Make your church a place women want to be.
Abortion restrictions result in increased crime rates and decreased GDP after about 15 years.
Abortion liberation results in lower crime rates and increased GDP after 15 years.
Abortion restrictions are bad for society.
The founding fathers got this right. The government doesn't have the right to protect an unborn fetus from it's host. Nor should it. There is no need for it. In fact, it's terrible for every constitutionally recognized citizen involved.
The idea that there's a line immediately preceeding a baby's crossing the threshold of the birth canal into the world simply makes no sense, unless you imagine some kind of magical transformation takes place, which is an untenable position given that we know no such transformation takes place.
There doesn't need to be a line. People aren't having late term abortions. This isn't a civic problem that needs to be specifically addressed by the law.
Simply protect the right of people to make their own reproductive decisions and they will generally make the correct choice for society.