IIRC, there was a point in the early 2000s when it became easier to make things 50 state instead of 49 state and then CA. This also was/is driven by several states adopting CA standards. Since the difference is fairly small, it makes sense just to build to one standard.

Probably does not affect all models, but would explain the NY vehicle meeting CA standards.

IMO, we should have Fed standards only. And to go further, we should reconcile standards world wide, especially European vs. US diesel standards. It's just nuts we can't get the high mpg oil burners here, and the differences in standards are simply crazy making, adding cost without any measurable benefit overall.