The Kurds are probably the biggest group of people without a formal nation, how would the world have changed if Kurdistan had become an independent state at any point during the 20th century post WW1?
A pretty awful mess. The Kurdish that Kurds in Iran speak has about as much in common with the Kurdish that Kurds in Turkey speak as Algerian Arabic does with Yemeni Arabic. It's difficult for all Kurds to understand each other without working out some sort of compromise dialect beforehand.
And that's just the language. The economic and political situation of Kurds in Turkey is different from that of Kurds in Iran which in turn are different from that of Kurds in Iraq. You try to unify them in a single national-state and you'll be tossing together radically different groups and hoping they somehow stick together just because they all share the same ethnonym.