It was a failed attempt to prevent discrimination against sex, specifically the female sex.
The struggle of women who through this amendment sought to guarantee equal rights for this gender were constant. The different organizations in favor of women have expressed that this gender has not yet been considered as equal in law to men, which is why in 1972 this amendment was presented and approved, both in the Senate and in the House of Representatives, However, due to various adverse situations, the debate on this amendment could never be carried out, so it finally expired in 1982 and it is for this reason that it is a failed attempt and is not part of the Constitution of the United States.