they have a specific language, as the Bretons in Bretagne, or the Alsaciens in Alsace
food is different as well as Northern France food is different than Southern France......
I would have liked to say "Language" even though they all speak French but have a very strong attachment to their culture because the the Corsican songs are awesome
But he correct answer is Economy
CESC = Conseil économique social et culturel de la Corse
hope I helped !!!