Definition of northernize in English:
northernize
(also northernise)
verb ˈnɔːð(ə)nʌɪzˈnɔːðənʌɪz
US with object To make northern in character.
Origin
Mid 19th century; earliest use found in John William Draper (1811–1882), chemist and historian. From northern + -ize.