1909
In accordance with a declaration by the Socialist Party of America, the first National Woman's Day (NWD) was observed across the United States on 28 February. Women continued to celebrate NWD on the last Sunday of February until 1913.

1910
At a Socialist International meeting in Copenhagen, an International Women's Day of no fixed date was proposed to honour the women's rights movement and to assist in achieving universal suffrage for women. Over 100 women from 17 countries unanimously agreed the proposal. 3 of these women were later elected the first women to the Finnish parliament.