▁bird ▁hunting , ▁thereby ▁leaving ▁the ▁matter ▁to ▁states ▁purs u ant ▁to ▁the ▁T enth ▁Am end ment . ▁▁ ▁Dis gr unt led ▁with ▁these ▁r ul ings , ▁Congress ▁then ▁emp ower ed ▁the ▁State ▁Department ▁to ▁negoti ate ▁with ▁the ▁United ▁Kingdom — which ▁at ▁the ▁time ▁still ▁largely ▁handled ▁the ▁foreign ▁relations ▁of ▁Canada — a ▁treat y ▁per tain ing ▁to ▁this ▁issue . ▁The ▁treat y ▁was ▁subsequently ▁rat ified ▁and ▁came ▁into ▁force , ▁requiring ▁the ▁federal ▁government ▁to ▁en act ▁laws ▁reg ulating ▁the ▁capt uring , ▁killing , ▁or ▁s elling ▁of ▁protected ▁mig rat ory ▁birds , ▁an ▁oblig ation ▁that ▁it ▁ful filled ▁in ▁the ▁Mig rat ory ▁Bird ▁Tre aty ▁Act ▁of ▁ 1 9 1 8 . ▁ ▁The ▁state ▁of ▁Missouri ▁requested ▁that ▁U . S . ▁Game ▁W arden ▁Ray ▁Holland ▁be ▁enjo ined ▁from ▁implementing ▁the ▁Act , ▁arg uing ▁that ▁it ▁was ▁" an ▁un const itution al ▁inter ference ▁with ▁the ▁rights ▁reserved ▁to ▁the ▁States ▁by ▁the ▁T enth ▁Am end ment , ▁and ▁[...] ▁the ▁acts ▁of ▁the ▁def endant ▁[...] ▁in va de ▁the ▁so ver eign ▁right ▁of ▁the ▁State ▁and ▁contra ven e ▁its ▁will ▁manif ested ▁in ▁stat utes ." ▁Additionally , ▁Missouri ▁claimed ▁that ▁states ▁had ▁an ▁" absolute " ▁right ▁to ▁reg ulate ▁game ▁within ▁their ▁borders ▁as ▁recognized ▁by ▁" anci ent ▁law , ▁fe ud al ▁law , ▁and ▁the ▁common ▁law ▁in ▁England