Mexican Peso History: Anybody know it?

In the parts of Mexico I visit - meaning the both coasts and tourist spots but not Mexico City or Jalisco - there are these foundations and unfinished structures everywhere you look. Why?


Seems I remember the Mexican Peso getting wrecked somtime in the early 1980's. Do these foundations date from that period? From what period do these foundations date?


I have noticed, when you drive up rural canyons outside urban areas in the US, the period of the architecture is almost like tidal marks, reaching a certain amount up the valley during a certain boom. Do these periods in our country coincide with the foundations in Mexico?


Can anybody, without offering any economic theory, offer a compact history of Peso/Dollar rates, Mexican forms of government, or whatever might be relevant?


Who the heck built those foundations!?!


Thanks.


MP