The Texas House of Representatives this week passed HB2, a bill to prohibit abortions after 20 weeks of gestation. Many opponents of abortion may hope this means that all late mid-term fetuses in Texas would soon be carried to term and live healthy lives instead of being terminated. But lost was any discussion of why women might seek a late mid-term abortion in the first place-and the unintended, counterintuitive effects of a ban on such procedures, which might even increase the total number of abortions.

Abortions today are common. At current rates, it is estimated that roughly 1 in 3 women will have one by the time they reach 45 years of age-including in places like Texas. One important reason is that half of all pregnancies are unintended. The cause isn’t just unprotected sex; as I wrote last year in Slate, many forms of birth control are much less reliable than many women realize. For example, 5 percent of women on the pill still get pregnant each year.

Of the roughly 7 million American pregnancies each year, about 1 million end in abortion. However, almost all of the procedures are performed early in pregnancy. According to the Guttmacher Institute, only about 1 […]

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