What milestone did the equal rights amendment achieve in 1972

On March 22, 1972, the Senate passed the Equal Rights Amendment to the United States Constitution,that proposed banning discrimination based on sex. The amendment was sent to the states for ratification, but it fell short of the three-fourths approval needed. It stated "Equality of rights under the law shall not be denied or abridged by the United States or by any state on account of sex." Lately , it became the law in 1972.

a.   it resulted in widespread unemployment.