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]

Moby Thesaurus II by Grady Ward, 1.0:

41 Moby Thesaurus words for "sectionalism":
   autarky, bimetallism, clannishness, clanship, cliqueyness,
   cliquishness, cliquism, denominationalism,
   economic self-sufficiency, esprit de corps, ethnocentricity,
   exclusiveness, faction, factionalism, free enterprise, free trade,
   governmentalism, laissez-faire, laissez-faireism, line, localism,
   managed currency, noninterference, nonintervention, nullification,
   partiality, partisanism, partisanship, party line, party principle,
   party spirit, planned economy, policy, polity, position,
   price supports, protection, protectionism, public policy,
   pump-priming, sectarianism