▁that ▁" it ▁seems ▁to ▁be ▁quite ▁clear ▁that ▁what ▁is ▁driving ▁this ▁is ▁what ' s ▁happening ▁in ▁their ▁home ▁countries ." ▁Mexico ▁and ▁Central ▁American ▁countries ▁have ▁since ▁taken ▁measures ▁to ▁try ▁to ▁reduce ▁the ▁flow , ▁the ▁U . S . ▁border ▁pat rol ▁has ▁sought ▁to ▁speed ▁app reh ensions , ▁and ▁the ▁Ob ama ▁administration ▁has ▁requested ▁additional ▁fund ing ▁for ▁screen ing ▁and ▁deport ation , ▁and ▁t ough er ▁pen alt ies ▁on ▁sm ug gl ers . ▁Ar rival s ▁of ▁children ▁at ▁the ▁U . S . ▁borders ▁slow ed ▁from ▁in ▁August ▁ 2 0 1 4 , ▁compared ▁to ▁May ▁and ▁June . ▁ ▁President ▁Ob ama ' s ▁executive ▁actions ▁and ▁efforts ▁to ▁legal ize ▁Und ocument ed ▁imm igr ants ▁On ▁November ▁ 2 0 , ▁ 2 0 1 4 , ▁in ▁a ▁tele vised ▁address ▁from ▁the ▁White ▁House , ▁President ▁Bar ack ▁Ob ama ▁announced ▁a ▁program ▁of ▁" de ferred ▁action " ▁which ▁would ▁allow ▁roughly ▁ 4 5 % ▁of ▁illegal ▁imm igr ants ▁to ▁leg ally ▁stay ▁and ▁work ▁in ▁the ▁United ▁States . ▁The ▁largest ▁prior ▁de fer ral ▁action , ▁in ▁ 1 9 9 0 , ▁during ▁the ▁administration ▁of ▁President ▁George ▁H . W . ▁Bush , ▁affected ▁ 4 0 % ▁of ▁und ocument ed ▁imm igr ants ▁then . ▁Up ▁to ▁ 3 . 7 ▁million ▁und ocument ed ▁parents ▁of ▁individuals ▁who ▁are ▁U . S .