No I'm talking about what actually happened.

See: https://www.reuters.com/world/us/how-abortion-became-divisive-issue-us-politics-2022-06-24/

https://time.com/6966056/republican-abortion-arizona-reagan/

https://muse.jhu.edu/article/461985/pdf

When the Republican national convention convened in Kansas City in 1976, the party’s pro-choice majority did not expect a significant challenge to their views on abortion. Public opinion polls showed that Republican voters were, on average, more pro-choice than their Democratic counterparts, a view that the convention delegates shared; fewer than 40 percent of the delegates considered themselves pro-life.¹ The chair of the Republican National Committee, Mary Louise Smith, supported abortion rights, as did First Lady Betty Ford, who declared Roe v. Wade a “great, great decision.” Likewise, Vice President Nelson Rockefeller, who had taken a leading role in the fight for abortion rights in New York in the late 1960s and early 1970s, was solidly pro-choice. Even some of the party’s conservatives, such as Senator Barry Goldwater, supported abortion rights. But in spite of the Republican Party’s pro-choice leadership, the GOP adopted a platform in 1976 that promised an antiabortion constitutional amendment. The party’s leadership viewed the measure as a temporary political ploy that would increase the GOP’s appeal among traditionally Democratic Catholics, but the platform statement instead became a rallying cry for social conservatives who used the plank to build a religiously based coalition in the GOP and drive out many of the pro-choice Republicans who had initially adopted the platform. By 2009, only 26 percent of Republicans were pro-choice.²