▁invest ment ▁from ▁agricult ure , ▁and ▁agricult ural ▁production ▁fell ▁dram atically . ▁ ▁In ▁ 1 9 3 0 , ▁the ▁armed ▁forces ▁forced ▁the ▁Rad ical s ▁from ▁power ▁and ▁improved ▁economic ▁conditions , ▁but ▁political ▁tur bul ence ▁intens ified . ▁In ▁ 1 9 3 2 , ▁Argentina ▁required ▁imm igr ants ▁to ▁have ▁a ▁labour ▁contract ▁prior ▁to ▁arrival , ▁or ▁proof ▁of ▁financial ▁means ▁of ▁support . ▁The ▁R oca - R unc iman ▁Tre aty ▁of ▁ 1 9 3 3 ▁gave ▁Argentina ▁a ▁qu ota ▁of ▁the ▁British ▁market ▁for ▁exports ▁of ▁its ▁primary ▁products , ▁but ▁the ▁disc rimin atory ▁British ▁imperial ▁tar iffs ▁and ▁the ▁effects ▁of ▁def lation ▁in ▁Britain ▁actually ▁led ▁to ▁a ▁small ▁decl ine ▁of ▁Argent ine ▁exports ▁to ▁Great ▁Britain . ▁ ▁Un emp loyment ▁resulting ▁from ▁the ▁Great ▁De pression ▁caused ▁un rest . ▁The ▁industrial ▁growth ▁sp urt ▁of ▁the ▁ 1 9 3 0 s ▁gradually ▁slow ed . ▁The ▁economic ▁conditions ▁of ▁the ▁ 1 9 3 0 s ▁contributed ▁to ▁the ▁process ▁of ▁internal ▁migration ▁from ▁the ▁coun tr ys ide ▁and ▁smaller ▁towns ▁to ▁the ▁cities , ▁especially ▁Buenos ▁Aires , ▁where ▁there ▁were ▁greater ▁opportun ities ▁for ▁employ ment . ▁The ▁urban ▁working ▁classes ▁led ▁several ▁un success ful ▁u pr is ings ▁prior ▁to ▁the ▁ 1 9 3 7 ▁president ial ▁elections . ▁Trad itional ▁export ▁agricult ure ▁st agn ated ▁at ▁the ▁out break ▁of ▁World ▁War