The concept of Nation-State is a few decades old phenomenon, which were encouraged on the pretext Nationalistic sentiments in late 19th and early twentieth century for the creation of the same entity. Modern day Sporting events play a major role in devising this concept.
Did anyone care about the nationality of Ruknidin Bibers, Alp Arsalan, Saldin Ayyubi or Mehmet Fatih Sultan?
Coming to the point of Nation-Estate in the context of Empires then we find that Iraq has never been a central power since centuries (after the fall of Abbasid caliphs) She has always been a vassal state of empires viz Samanid ,Ottoman, Safavid etc. Jordan is truly an artificial state created on Psykes-Picot. Pakistan was carved out for purely religious reasons for the South Asian ******* ( can't be called a an artificial state) It's viability or not is altogether a different subject; Turkey has always been the central power since 1071 with ups & downs.
Actually geography is man-made and it never remain intact with the identical map for so long. Now, it seems in the background of recent uphill in the MENA region; geography is again going to get altered.