I think I've mentioned the newish LDS lessons on the history of the church in Mexico. These were apparently commissioned by the Mexico area and were written in Spanish for members of the church in Mexico by an American scholar/missionary (maybe someday there will be a set of lessons written by a Mexican scholar).
It appears that not all of the lessons are on the lds.org Spanish website (that website is clearly not updated as often as it should be), but they are on the sud.org website.
I have never seen an English translation so you either need to read Spanish, or, even better, call a Mexican in your ward who speaks English also to teach these lessons as an alternative Sunday School class for a couple of months. Learning about the history of the church in other countries is very worthwhile and church history in Mexico has some important and overlooked events, especially regarding the Third Convention.