Step 1 : Introduction to the question "Which month is Women's History Month in the U.S.?"
...Women's History Month is an annual declared month that highlights the contributions of women to events in history and contemporary society. It is celebrated during March in the United States, the United Kingdom, and Australia, corresponding with International Women's Day on March 8, and during October in Canada, corresponding with the celebration of Persons Day on October 18
Step 2 : Answer to the question "Which month is Women's History Month in the U.S.?"
Women's History Month grew into a nationally recognized celebration, beginning in the United States in 1987. It grew from a California small-town school event into a national recognition of the contributions women made and continue to make to society, culture and history. The local school district in Sonoma, California, began the tradition with a week-long celebration in 1978. In 1980, it caught the attention of President Jimmy Carter, who issued a presidential proclamation designating National Women's History week for the week of March 8. Six years later, Congress expanded the event to a month-long celebration in March. Source: History.com