This will be the first time that the Mexican army has conducted any exercise in the Unites States since backs in the 1840's...

What about Pancho Villa? I suppose technically that would have been "a Mexican army" rather than "the Mexican army", but that's splitting hairs.

They'd better have checked with the US authorities, who have some funny ways of dealing with people who want to help. It appears that the USA is ignoring/rejecting the offer from Cuba of medical aid. Rather the same way the Russian government refused to accept foreign help with the Kursk submarine disaster, which would well have saved the lives of the poor bloody saubmariners who died. Bastards.