northernism
/ˈnɔːð(ə)nɪz(ə)m/ /ˈnɔːðənɪz(ə)m/noun
1The character, quality, or views of the northern part of a country or region; (in early use) specifically the political character or views of the northern part of the United States.
2An idiom, form of expression, or manner of speech, etc., characteristic of northerners.
Origin
Mid 19th century. From northern + -ism.