2 , ▁diplom atic ▁miss ions ▁in ▁each ▁other ' s ▁capit als ▁were ▁upgrad ed ▁to ▁emb ass ies , ▁respectively . ▁During ▁World ▁War ▁II , ▁both ▁Brazil ▁and ▁Mexico ▁were ▁the ▁only ▁two ▁Latin ▁American ▁nations ▁to ▁declare ▁war ▁on ▁the ▁A xis ▁powers ▁and ▁to ▁send ▁troops ▁to ▁fight ▁abroad . ▁Brazil ▁sent ▁an ▁expedition ary ▁force ▁to ▁fight ▁in ▁Italy ▁while ▁Mexico ▁sent ▁the ▁ 2 0 1 st ▁F ighter ▁Squadron ▁to ▁fight ▁in ▁the ▁Philippines . ▁In ▁ 1 9 6 0 , ▁President ▁Ad ol fo ▁López ▁Mate os ▁became ▁the ▁first ▁Mexican ▁head - of - state ▁to ▁pay ▁an ▁official ▁visit ▁to ▁Brazil . ▁The ▁visit ▁was ▁reci proc ated ▁with ▁the ▁visit ▁to ▁Mexico ▁by ▁Brazil ian ▁President ▁João ▁G oul art ▁in ▁ 1 9 6 2 . ▁Since ▁the ▁initial ▁vis its , ▁there ▁have ▁been ▁several ▁high - level ▁vis its ▁by ▁leaders ▁of ▁both ▁nations . ▁ ▁On ▁ 1 ▁June ▁ 2 0 0 2 , ▁Mexico ▁and ▁Brazil ▁signed ▁an ▁Econom ic ▁Com plementation ▁Ag re ement ▁( known ▁as ▁A CE ▁ 5 3 ). ▁In ▁accord ance ▁with ▁the ▁decision ▁of ▁Mexican ▁President ▁En rique ▁Pe ña ▁N iet o ▁and ▁Brazil ian ▁President ▁D il ma ▁R ous se ff ▁in ▁July ▁ 2 0 1 5 , ▁the ▁First ▁Round ▁of ▁Neg oti ations ▁of ▁the ▁Econom ic ▁Com plementation ▁Ag re ement ▁was ▁held ▁in ▁Mexico ▁City , ▁and ▁both ▁leaders