▁the ▁country ▁was ▁em bro iled ▁in ▁the ▁Mexican ▁Revolution ▁at ▁the ▁time . ▁ ▁The ▁ 1 9 2 0 s ▁brought ▁an ▁age ▁of ▁great ▁prosper ity ▁in ▁the ▁United ▁States , ▁and ▁to ▁a ▁less er ▁degree ▁Canada . ▁But ▁the ▁Wall ▁Street ▁Cr ash ▁of ▁ 1 9 2 9 ▁combined ▁with ▁dr ought ▁us her ed ▁in ▁a ▁period ▁of ▁economic ▁hard ship ▁in ▁the ▁United ▁States ▁and ▁Canada . ▁From ▁ 1 9 3 6 ▁to ▁ 1 9 4 9 , ▁there ▁was ▁a ▁popular ▁u pr ising ▁against ▁the ▁anti - C atholic ▁Mexican ▁government ▁of ▁the ▁time , ▁set ▁off ▁specifically ▁by ▁the ▁anti - cler ical ▁prov isions ▁of ▁the ▁Mexican ▁Constitution ▁of ▁ 1 9 1 7 . ▁ ▁Once ▁again , ▁Canada ▁found ▁itself ▁at ▁war ▁before ▁its ▁neighb ors , ▁however ▁even ▁Canadian ▁contributions ▁were ▁slight ▁before ▁the ▁Japanese ▁attack ▁on ▁Pear l ▁Har bor . ▁The ▁entry ▁of ▁the ▁United ▁States ▁into ▁the ▁war ▁helped ▁to ▁tip ▁the ▁balance ▁in ▁favour ▁of ▁the ▁al lies . ▁Two ▁Mexican ▁tank ers , ▁transport ing ▁oil ▁to ▁the ▁United ▁States , ▁were ▁attacked ▁and ▁s unk ▁by ▁the ▁Germ ans ▁in ▁the ▁G ulf ▁of ▁Mexico ▁waters , ▁in ▁ 1 9 4 2 . ▁The ▁incident ▁happened ▁in ▁spite ▁of ▁Mexico ' s ▁neutral ity ▁at ▁that ▁time . ▁This ▁led ▁Mexico ▁to ▁enter ▁the ▁conflict ▁with ▁a ▁declaration ▁of ▁war ▁on ▁the ▁A xis ▁nations . ▁The ▁destruction ▁of