After WWI the Ottoman Empire nationalism was able to hold ground in Egypt and Turkey, but places like Mesopotamia were unable to realize their goals. Arab Nationalism fell to a mandate system and a regional state system afterwards. This is where we can see the rise of crazy dictatorships such as Suddam Hussein trying to change a countries history and protects its borders out of jealousy.
The rise of nationalism makes it hard to imagine any kind of nationalism without Border States and with so much diversity within so many different tribes. Since the Ottoman Empire was so large and expansive it is hugely impossible to imagine one nation to be proud of and call one singular home which makes the Arab a very mobile society not knowing exactly where to call home or its