▁ ▁American ▁League ▁( AL ) ▁teams ▁have ▁won ▁ 6 6 ▁of ▁the ▁ 1 1 5 ▁World ▁Series ▁played ▁( 5 7 . 3 %). ▁The ▁New ▁York ▁Yan ke es ▁have ▁won ▁the ▁most ▁titles ▁in ▁ML B ▁with ▁ 2 7 ▁total , ▁account ing ▁for ▁ 2 3 . 4 % ▁of ▁all ▁series ▁played ▁and ▁ 4 0 . 9 % ▁of ▁the ▁wins ▁by ▁American ▁League ▁teams . ▁The ▁St . ▁Louis ▁Card inals ▁have ▁won ▁ 1 1 ▁World ▁Series , ▁second - most ▁among ▁all ▁ 3 0 ▁teams ▁and ▁most ▁among ▁National ▁League ▁franch ises , ▁account ing ▁for ▁ 9 . 5 % ▁of ▁all ▁series ▁played ▁and ▁ 2 2 . 4 % ▁of ▁the ▁ 4 9 ▁National ▁League ▁vict ories . ▁ ▁When ▁the ▁first ▁modern ▁World ▁Series ▁was ▁played ▁in ▁ 1 9 0 3 , ▁there ▁were ▁eight ▁teams ▁in ▁each ▁league . ▁These ▁ 1 6 ▁franch ises , ▁all ▁of ▁which ▁are ▁still ▁in ▁existence , ▁have ▁each ▁won ▁at ▁least ▁two ▁World ▁Series ▁titles . ▁ ▁The ▁number ▁of ▁teams ▁was ▁un changed ▁until ▁ 1 9 6 1 , ▁with ▁four teen ▁expansion ▁teams ▁joining ▁ML B ▁since ▁then , ▁all ▁of ▁which ▁except ▁the ▁Seattle ▁Mar in ers ▁have ▁appeared ▁in ▁at ▁least ▁one ▁World ▁Series . ▁Of ▁the ▁ 2 3 ▁Series ▁in ▁which ▁at ▁least ▁one ▁expansion ▁team ▁has ▁played , ▁including ▁two ▁Series ▁( 2 0 1 5 ▁and