[dragonwriter]

> Using countries is a very inaccurate way to measure diversity.

It's a perfectly accurate (fraud aside) measure of diversity in country of origin. Whether that's a meaningful kind of diversity is a different question.

> The EU is many countries, but is less diverse than India, a single country.

Less diverse in what?

> If India reformed itself as a union of states, suddenly the backlog of Indian immigrants would be cleared!

That assumes that the sourcing of qualified prospective Indian immigrants to the US is basically uniform across the succesor states India would be a subdivided into.