New Englandism
/ˌnjuː ˈɪŋɡləndɪz(ə)m/noun
1An idiom or mode of expression peculiar to New England.
2Behaviour or temperament considered characteristic of New Englanders; (originally) specifically. New England theology.
Origin
Mid 19th century; earliest use found in The Boston Evening Transcript. From the name of New England + -ism.