Maybe, maybe not, but thats a different battle altogether, and right now a huge portion of American politics revolve around this definition of diversity, and if it didn't, it's likely immigration would get stricter, not looser.

I'm Indian and I find that claim hard to believe. Countries like the United States and Canada are far more heterogenous, unless you want to say everyone who speaks a different language is different in any way other than the language (mostly not;).

It is not just language. It is skin color (some are fair skinned like Europeans, some are dark skinned like Africans), food (North and South Indian food are very different), clothes, religion (which is very important in India), income levels (extreme poverty as well as extreme wealth), education (most of the country is illiterate, but there also world-class institutions such as IITs, culture (India has higher female participation in the workforce, in IT at least, that the US, yet, in certain villages there is "honor killings" and so on.) Yes, India is absolutely the most diverse country in the world, and it is many times more diverse than the US.

Double bell curves != diversity

Country caps are based on country of birth (with some exceptions that don't apply to most people). From that standpoint, US-born people are actually very heterogenous relative to other large countries, and the same applies to Canada-born people.

Why do you think India is called a subcontinent?

>Countries like the United States and Canada are far more heterogenous

That's only in the media and big cities.