Maybe you are too young to remember and I did not know what has happened in recent years.
http://en.wikipedia.org/wiki/Multiple_citizenship
(from within document)
As a result, the theory of perpetual allegiance largely fell out of favor with governments during the late 19th century. With the consensus of the time being that dual citizenship would only lead to diplomatic problems, more governments began prohibiting it, and revoking the nationality of citizens holding another nationality. By the mid-20th century, dual nationality was largely prohibited worldwide, although there were exceptions. For example, a series of U.S. Supreme Court rulings permitted Americans born with citizenship in another country to keep it without risking their U.S. citizenship.[SUP]
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At the
1930 League of Nations Codification Conference, an attempt was made to codify nationality rules into a universal worldwide treaty, the 1930 Hague Convention, whose chief aims would be to completely abolish both statelessness and dual citizenship. It proposed laws that would have reduced both, but in the end was ratified by only 20 nations.[SUP]
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However, the consensus against dual nationality began to erode, and by the l
ate 20th century, it was becoming gradually accepted again,[SUP]
[2][/SUP] with many states lifting restrictions on dual citizenship. For example, the
British Nationality Act 1948 removed restrictions on dual citizenship in the United Kingdom, the 1967
Afroyim v. Rusk ruling by the U.S. Supreme Court prohibited the U.S. government from involuntarily stripping citizenship from Americans over dual citizenship, and the
Canadian Citizenship Act, 1976, removed restrictions on dual citizenship in Canada. The number of states allowing multiple citizenship further increased after a treaty in Europe requiring signatories to limit dual citizenship lapsed in the 1990s, and countries with high emigration rates began permitting it to maintain links with their diasporas.[SUP]
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I guess I live and learn.