Well, I may have nothing to say, but Jeff Toobin does. And he says it so very well in The New Yorker.
“In the United States, at the time the Constitution was adopted, abortions before “quickening” were both legal and commonplace, often performed by midwives. In the nineteenth century, under the influence of the ascendant medical profession, which opposed abortion (and wanted to control health care), states began to outlaw the procedure, and by the turn of the twentieth century it was all but uniformly illegal. The rise of the feminist movement led to widespread efforts to decriminalize abortion, and in 1973 the Supreme Court found, in Roe v. Wade, that the Constitution prohibited the states from outlawing it.”