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The number of pro-choice court victories, however, pales against the blizzard of pro-life bills that have been introduced — and often enacted — across the nation as Republicans increased their strength in state after state in the past two election cycles.

From 2000 to 2011, the number of states “supportive” of abortion fell to 15, while “fully 55 percent of women of reproductive age” live in one of the 26 states considered “hostile” to abortion,” the Guttmacher Institute said in a report issued in early 2012.

State lawmakers are not finished, either: Since mid-2012, states enacted about 40 more abortion-restricting measures, Guttmacher researchers found.

This proliferation of restrictions is cited by the Centers for Disease Control and Prevention as a likely reason why the number of abortions is declining in the United States.

In 2009, the number of reported abortions fell to 784,507, an unusually steep 5 percent decline from the previous year, the agency said in a November report.

Moreover, the 2009 abortion rate of 15.1 abortions per 1,000 women of reproductive age was the lowest since the procedure was legalized in 1973, researchers said.

Pro-choice advocates are gearing up to fight abortion restrictions this year.

Fierce clashes forecast

Michigan’s governor said last week that the lobbying for and against the abortion bill was among the fiercest he had seen since taking office in 2011. The law requires doctors in the state to screen patients to ensure that they were not coerced into requesting an abortion and requires clinics that perform more than 120 abortions annually to be licensed.

“To be screened for coercion is a reasonable thing,” Mr. Snyder told reporters in Lansing on Friday, according to the Detroit News. “It is really a question of women’s health and safety.”

But the governor, already under fire from labor groups for signing a bill last month making Michigan a right-to-work state, can expect to face more heat from pro-choice groups.

“Republicans across the country saw the consequences of their war on women this past November, and if Gov. Snyder thinks we’re naive enough to believe his ridiculous excuses for signing this bill into law, he’s sadly mistaken,” said Michigan state Sen. Gretchen Whitmer, who called the law “disgraceful.”

But pro-life advocates promise that with new political allies in place and evidence of a growing pro-life sentiment among young Americans, they are not backing down on abortion politics, either.

“Pro-life intensity on this issue is not going to diminish anytime soon,” Mrs. Dannenfelser said.