Humn not really, it does not violate the Quran. The verse basically say that all people descend from Adam and Hawaa', the only difference is religion.

Tafsee Ibn Katheer. I believe, that the verse was revealed because people were making fun of Bilal RA (he was freed from slavery and was black).

The Muslim concept of a nation is based strictly on religion, as long as you are a Muslim you can go, work, and live in any land that is considered Dar Al Islam.

All modern "Muslim" nations were created by the west as a result of decades of colonization, sometimes they divided Muslim on the basis of their understanding of nation (Greek/Roman: if people share the same language, culture, ancestors they should be considered as a nation), sometimes just to profit from the land or the old divide and conquer.

The result was catastrophic on Muslims, they imposed borders on Muslims thus limiting their freedom. They also impose western laws and secular regimes on Muslims that act as watch dog to prevent any hope of reunifying Muslims.

The funny thing is, if you are from a western country, you can go make a tour from Morocco to Indonesia without a lot of trouble. Try doing that if you are from a "Muslim" country, you can't even enter Algeria from Morocco by land.