Why would they do this?!?!
I thought it was obvious that children need sleep in order to learn and grow.
Secondly even if I put on a tinfoil hat I can't see even a financial incentive for getting rid of naps. That's down time that kindergarten teachers get to relax in the relative quiet and organize things.
So what possible rationale is there for getting rid of nap time?
If your child can't read and write their own name by the time they get to kindergarten, they are considered behind age appropriate. This isn't an affluent area of the US, either. It's a rural, poor area.
The quest to test is what's eliminating all 'extra' times in schools. We have to beat China, Korea and all of Europe on standardized dick measuring tests, so our children get to suffer (unless you can afford alternate private schools like forest schools or something similar).
Although it's possible I'm just misremembering, and I got to sleep just fine most of the time and only remember the times I lay awake thinking about how I hated naptime.
That probably doesn't answer your question directly, but it may be for similar practical reasons this is happening elsewhere (if it is - I don't know).