Even though many of us think that it is a more recent event, International Women’s Day (IWD) has actually been observed since the early 1900s. At the time, women were experiencing pay inequality, a lack of voting rights, and being overworked. In response to it, 15,000 women marched through New York City in 1908 to demand their rights. A year later in 1909, the first National Women’s Day was observed. It was celebrated on the last Sunday of February until 1913.