No, that's exactly the point. A lot of countries have federal subdivisions, with different laws, customs, and traditions (from the UK to Brazil, Russia, India, etc). Hell, some even have different official languages (Canada, Belgium: just two examples). Even nominally unitary nations like France or China have wildly different communities living in the same country. The US is not alone, or even peculiar, in this: it's not the largest, the most populous, or even the most diverse federal country in the world. Generally speaking, there is no more difference between California and Ohio than between Punjab and Kerala, Bavaria and Brandenburg, Sicily and Trentino. That's the point I was trying to make.