-sh(ə)nəˌlizəm noun
( -s )
: disproportionate devotion to the interests peculiar to one section (as of a country) : sectional feeling, spirit, or prejudice : consciousness by the people of a section of a common and peculiar set of identifying characteristics (as customs, interests, or social traits)
when sectionalism exists within a state … it may be an upstate versus downstate division — D.D.McKean