From the National Archives EEO Special Emphasis Observances:

“National Women's History Month was established by presidential proclamation in order to draw attention to and improve the focus on women in historical studies. It began in New York City on March 8, 1857, when female textile workers marched in protest of unfair working conditions and unequal rights for women. It was one of the first organized strikes by working women, during which they called for a shorter work day and decent wages. Also on March 8, in 1908, women workers in the needle trades marched through New York City's Lower East Side to protest child labor, sweatshop working conditions, and demand women's suffrage. Beginning in 1910, March 8 became annually observed as International Women's Day. Women's History Week was instituted in 1978 in an effort to begin adding women's history into educational curricula. In 1987, the National Women's History Project successfully petitioned Congress to include all of March as a celebration of the economic, political and social contributions of women.”