How the Industrial Revolution created division among classes.

The formation of distinct classes, especially in the rapidly industrializing north, was one of the most striking developments. the unequal distribution of newly created wealth spurred new divisions along class lines. each class had its own specific culture and views on the issue of slavery.

*taken directly from the web! please re-word if needed.*

I have chose primary source to be the answer. Check out the definition of "primary source." secondary wouldn't make sense here.