Every Civilization Has Practiced Abortion

Some people point to abortion as evidence of the moral decline of modernity.

There isn't anything "modern" about abortion. Abortion has been practiced by every civilization that exists or has ever existed, since the beginning of time.

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To facilitate understanding of the controversial subject of abortion, its historical background is reviewed, followed by consideration of the contemporary indications for therapeutic abortion and the current legal abortion practices in the US. An ancient practice, the records of almost every civilization indicate knowledge of abortifacient and abortion techniques.
http://www.popline.org/docs/0817/045768.html

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Abortion is probably the world's most common surgical procedure. About 46 million abortions are performed every year, 20 million of them illegal. Abortion is practiced widely by women all over the world, across all social classes, and regardless of laws against abortion. Since the beginning of recorded history, abortion has been commonly practiced by almost all societies, including ancient China, Egypt, Greece, Rome, and countless others. In fact, abortion could be called a fundamental aspect of human behaviour.

About 35 out of every 1000 women of childbearing age have an abortion each year. That's an average of one abortion for every woman over her lifetime.
http://www.prochoiceactionnetwork-canada.org/civilize.html

Even infantucide has been practiced widely:

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Infanticide has been practiced on every continent and by people on every level of cultural complexity, from hunters and gatherers to high civilization, including our own ancestors. Rather than being an exception, then, it has been the rule.
There is ample historical evidence to document the incredible propensity of parents to murder their children under an assortment of stressful situations. In nineteenth century England, for example, infanticide was so rampant throughout the country that a debate over how to correct the problem was carried out in both the lay and medical press.

http://www.infanticide.org/history.htm