The first wave: from 1848
The first wave of feminism refers to the campaign for the vote. It began in the
United States in 1848 with the Seneca Falls Convention, where 300 gathered to
debate Elizabeth Cady Stanton’s Declaration of Sentiments, outlining women’s
inferior status and demanding suffrage – or, the right to vote.
It continued over a decade later, in 1866, in Britain, with the presentation of a
suffrage petition to parliament.
This wave ended in 1920, when women were granted the right to vote in the US.
(Limited women’s suffrage had been introduced in Britain two years earlier, in 1918.)
https://theconversation.com/what-are-the-four-waves-of-feminism-and-what-comes-next-224153