"Rights groups worldwide celebrate International Women’s Day (IWD)...as they commemorate women’s achievements and call for equality. But for an event championed by international nongovernmental organizations and major global corporations, it may surprise some that IWD was born out of the U.S. socialist movement in the early 20th century. In 1909 the Socialist Party of America organized a New York City march commemorating a garment workers’ strike the previous year. The party called it National Women’s Day, and women organized by the group demonstrated for better pay and working conditions as well as the right to vote, according to the International Women’s Day website. The Socialist Party continued to hold Women’s Day celebrations on the last Sunday of February for the next few years, and newspapers from the era mentioned International Women’s Day on Feb. 27, 1910 — when thousands of women organized by the socialist movement gathered at Carnegie Hall, according to World March of Women, an international grass-roots campaign. European women, meanwhile, were championing similar ideals. At the second annual meeting of the International Conference of Working Women in Copenhagen in 1910, Clara Zetkin, a prominent Marxist activist from Germany’s Social Democratic Party, proposed the idea of holding an international day for women. She thought that women should press for their demands for equality and suffrage on a single day of celebration. The conference agreed."