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.
I am a creole from Louisiana and there is a difference between creoles and Cajuns! Gumbo is a creole dish but them Cajuns can sure cook it. My ex is a mixed creole from Slidell and I couldn't stand their gumbo. Now I throw a lot of Cajun in mine.