no, there is no limit. One country cannot dictate who another country can give citizenship to. I hold Canadian, American and German citizenships. The Americans say I can only have one, but really there is nothing they can do about it, and they probably don't even know anyhow. I was born American in Canada, aquring both at birth. In 1995 Germany reinstated all citizenships for people and their kids displaced during the 2nd world war, which was my father, sister and self.