It depends on the countries they want to be a citizen of; whether they allow multiple citizenship or not. For example, one can have British, Canadian, America, Australian and Italian citizenship at the same time because all allow multiple citizenship. But, if the same person wants to become a German citizen, they must give up all five before doing so.
I don't think there are many or any places who have restrictions on cheering due to somebody's nationalites.
they are all American
Russians,Ukrainians and Yugoslavian.
American, but his grandfather on his dad's side was from Norway.
American, he was born in Owensboro, Kentucky. German, Irish and Cherokee Indian
One person should be introduced at one time only.
As many as they want.
As many as they want.
1 one
One person cannot be their own corporation. This is because there are too many jobs to be done by one person efficiently.
no
or the italtians are not all italtian and they have some other nationalites in them