USA has the highest incarceration rate. Why?

[badgenome]

Level1Death said:

RolStoppable said:
You have too many guns.

This. Plus we commit the most crimes.            

http://www.nationmaster.com/graph/cri_tot_cri-crime-total-crimes

Incarceration rate means per capita, so the more relevant statistic is this one.

Anyway, as others have said, it's because of the war on drugs.