▁Ri ple y ▁advoc ated ▁a ▁simplified ▁ra cial ▁view ▁and ▁proposed ▁a ▁single ▁Te ut onic ▁race ▁linked ▁to ▁ge ographic ▁areas ▁where ▁Nord ic - like ▁characteristics ▁pre dom inate , ▁and ▁contrast ed ▁these ▁areas ▁to ▁the ▁boundaries ▁of ▁two ▁other ▁types , ▁Al pine ▁and ▁Mediter rane an , ▁thus ▁reducing ▁the ▁' c au cas oid ▁branch ▁of ▁human ity ' ▁to ▁three ▁distinct ▁groups . ▁ ▁Early ▁ 2 0 th ▁century ▁theories ▁ ▁By ▁ 1 9 0 2 ▁the ▁German ▁arch ae ologist ▁Gust af ▁K oss in na ▁identified ▁the ▁original ▁A ry ans ▁( Pro to - Ind o - Europe ans ) ▁with ▁the ▁north ▁German ▁Cord ed ▁W are ▁culture , ▁an ▁argument ▁that ▁gained ▁in ▁currency ▁over ▁the ▁following ▁two ▁dec ades . ▁He ▁placed ▁the ▁Ind o - Europe an ▁Ur heim at ▁in ▁Schles wig - Hol stein , ▁arg uing ▁that ▁they ▁had ▁expanded ▁across ▁Europe ▁from ▁there . ▁By ▁the ▁early ▁ 2 0 th ▁century ▁this ▁theory ▁was ▁well ▁established , ▁though ▁far ▁from ▁univers ally ▁accepted . ▁Soci olog ists ▁were ▁soon ▁using ▁the ▁concept ▁of ▁a ▁" bl ond ▁race " ▁to ▁model ▁the ▁migr ations ▁of ▁the ▁supposed ly ▁more ▁entrepr ene ur ial ▁and ▁innov ative ▁components ▁of ▁European ▁populations . ▁▁ ▁By ▁the ▁early ▁ 2 0 th ▁century , ▁Ri ple y ' s ▁tri part ite ▁Nord ic / Al pine / Med iter rane an ▁model ▁was