Answer Wiki. Wikipedia has a fairly good summary - Modern art - defining it broadly as art from much of the second half of the 19th century through nearly 3/4 of the 20th. There's also a piece on Modernism in the arts from the mid-19th century through the present.
Another major difference that can be seen between Cajun and Creole is in their foods. The food of Creole is Afro-European with some French flair. On the other hand, Cajun foods have a French influence. One can also see that the two sects of people practise and love different music.
Creole refers to the people of French descent and to French-speaking African Americans in Louisiana and parts of the Caribbean. Cajun is a corruption of the work 'Acadian', people of French and Scottish descent who originally settled in Nova Scotia and then moved to Louisiana in the 18th Century.