However you cut it, divorce rates are substantially higher among the working class. If you look at educational attainment:

% divorced among those married, by age 46:

Did not graduate from high school: 58.8

High school graduate, no college: 49.1

Some college or associate degree: 48.5

Bachelor's degree or higher: 29.8

https://www.bls.gov/opub/mlr/2013/article/pdf/marriage-and-d...