The Collaborative International Dictionary of English v.0.48:

Sectionalism \Sec"tion*al*ism\, n.
   A disproportionate regard for the interests peculiar to a
   section of the country; local patriotism, as distinguished
   from national. [U. S.]
   [1913 Webster]

WordNet (r) 3.0 (2006):

sectionalism
    n 1: a partiality for some particular place [syn:
         sectionalism, provincialism, localism]