This pole stands in Chapultepec Park in Mexico City. It was carved by Mungo Martin and Tony Hunt and given by the Diefenbaker government to Mexico on the 150th anniversary of Mexican independence. Source.
The first ever meeting of a Canadian Prime Minister (St. Laurent) and a Mexican President (Cortines) took place at White Sulphur Springs, West Virginia in March, 1957, at the invitation of US President Eisenhower, 37 years before NAFTA. Source.
Agustin de Iturbide, aka Emperor Agustin, abdicated on this date in 1823, bringing the First Mexican Empire to a close. Here he is on an 8 reales piece. Source.