when was march declared women's history month
National Womenâs History Month. By 1986, 14 states had already declared March as Womenâs History Month. This momentum and state-by-state action was used as the rational to lobby Congress to declare the entire month of March 1987 as National Womenâs History Month. In 1987, Congress declared March as National Womenâs History Month in perpetuity.