Women opposed to the Equal Rights Amendment sit with Phyllis Schlafly, center, national chairman of Stop ERA, at a hearing in Kansas City in 1976. Schlafly, who helped defeat the Equal Rights Amendment in the 1970s, has died at 92.

ST. LOUIS — Phyllis Schlafly, the outspoken conservative activist who helped defeat the Equal Rights Amendment in the 1970s and founded the Eagle Forum political group, has died. She was 92.

Schlafly’s family was with her when she died Monday afternoon of cancer at her home in St. Louis, her son John Schlafly said.

Schlafly rose to national attention in 1964 with her self-published book, “A Choice Not an Echo,” that became a manifesto for the far right. The book, which sold three million copies, chronicled the history of the Republican National Convention and is credited for helping conservative Sen. Barry Goldwater of Arizona earn the 1964 GOP nomination.

She later helped lead efforts to defeat the proposed constitutional amendment that would have outlawed gender discrimination, galvanizing the party’s right. She’d graduated from college while working overnight at a factory during World War II, her newspaper column appeared in dozens of newspapers and she was politically active into her 90s — including attending every convention since her first in 1952. She attended this year’s convention as a Donald Trump delegate.

Yet she told The Associated Press in 2007 that perhaps her greatest legacy was the Eagle Forum, which she founded in 1972 in suburban St. Louis, where she lived. The ultraconservative group has chapters in several states and claims 80,000 members.

“I’ve taught literally millions of people how to participate in self-government,” Schlafly said. “I think I’ve built a wonderful organization of volunteers, mostly women but some men, willing to spend their time to get good laws and good politicians.”