From Texas Standard:
Let’s start 50 years ago when the United Nations declared family planning as a human right. Here's what Mexico’s UN Representative, Antonio Martínez Báez, said back then: “México emitió su voto favorable, con profunda convicción, reiterando así su actititud de lograr una completa igualdad para la mujer en todos los campos jurídicos, económicos y sociales.”
He said that his country voted in favor of the resolution, and not only in favor, but with deep conviction, in the hopes that women could achieve full equality under the law and in every facet of life.
Mexico took that UN resolution to heart.