why does a certified nurse assistant (cna), get paid less than a nurse assistant?

if they are the same job and job requirements, then why does a cna, get paid less? like 30grand less?

There is no assistant getting 30 grand less LOL. CNA is the same as a nurse assistant. The CNA just has taken a state test to become certified. Pay rates are different in a few states but for the most part a CNA is making tops 12.00 per hour. So a 40 hour work week puts them at 26K a year straight pay.
They should be at 40K on low end with the amount of work they do. They are the backbone.