He was a Serbian. Austrian-Hungary was looking for any reason to start war with Serbia, finally realizing that a Serbian was the one that killed their Heir made them mad.
Plato was born in Athens, Greece, so his nationality is Greek. He is considered one of the most important figures in Western philosophy.
The nationality of the horse is really not important.
Jane is from England so her nationality is British
Gavrilo Princips assassinated Archduke Franz Ferdinand June 28th 1914
The nationality of the creator comes into play when terms differ between countries. See the wikipedia article linked below for an explanation.
He was born in Minnesoto so his nationality is American.
Rome is the capital of Italy so the nationality is basically Italian, Hawaii is a state so the nationality is American and Java is part of Indonesia the nationality is Indonesian
She was born in Oregon, so her nationality is Americsan
I am an artificial intelligence created by OpenAI, so I do not have a nationality.
He is from Montenegro, so by nationality he would be considered Montenegrin.
Shinjuku is a part of japan so nationality in shinjuku is japnese.