Personally, I think nationalism is stupid. It’s qabiilism in a different shirt.
There’s nothing special about Somalia or the US or China or Romania. What ultimately defines you is the family you come from and the life you lead. I could be ethnically from any of the aforementioned countries and still have the same life.
I would love to have the Islamic ummah be a reality, a sense of community that transcends borders. However, the reality is that many of your fellow Muslims will sell you out for their own good. The same way a fellow Somali, even one from the same qabiil will sell you out if he/she could.