On September 27, 1930, Foreign Secretary Genaro Estrada released a statement to the press. Mexico would no longer grant formal recognition to foreign governments. It called the practice “denigrante” (degrading), because it passed judgment on other nations. Mexico would limit itself “a mantener o retirar, cuando lo crea procedente, a sus agentes diplomáticos” (to keeping or withdrawing its diplomats when it sees fit).
Some articles in the Foreign Ministry’s own journal give the date as September 26. In 1988, non-intervention was written into Article 89 of the Constitution as a principle of foreign policy.