As a popular historian, I’ve spent the last two years researching women’s protest marches. My takeaway? When women march with purpose, the country (purposefully?) forgets them.

Somehow, the story of their heroism seems to be purged from our collective national memory or otherwise whitewashed. In fact, Saturday’s Women’s March on Washington marks at least the eleventh time women have organized a large-scale march on the capital, on issues ranging from war to the right to vote.