There is NO economic aid from the US to Mexico!
Assuming you mean the kind voted on by Congress, like the money we give to Egypt, Israel, and some other African countries annually.
If you mean that the US has long - under both Dems and
Repubs - turned a blind eye to illegal immigration so as to prevent a strong revolutionary movement from arising in Meixco (the most desperate and ambitious folks there cross the border) then of course we "give" them lots of aid. IE. we support their corrupt governments.
Ditto for the almost 20 year old NAFTA deal, which allows free trade between the Big 3 N. American nations. The big Mexican capitalists (like Carlos Slim) have benefitted tremendously from NAFTA. If has, howver, hurt the US.
But there is no DIRECT foreign aid to Mexico.