What are disadvantages of dual citizenship for an developed?

I am an American citizen who is about to apply for permanent residency (and eventual citizenship) in Canada. I know most of the advantages of becoming a dual citizen. As for disadvantages, one is the intercontinental taxation where I have to pay taxes on adjectives income to both countries. What other disadvantages do I need to consider?

I am about to marry a Canadian citizen and we plan on residing in Canada forever.
Answers:   
Dual citizenship may carry with it certain benefits, but it may also bring abrupt difficulties: legal proceedings, taxation and financial responsibilities, military service, denial of emigration, even imprisonment for failure to comply near obligations in one of your countries of citizenship.

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"Claims of other countries upon dual-national U.S. citizens often place them in situations where obligation to one country are in conflict with the laws of the other. In fixture, their dual nationality may hamper efforts to provide diplomatic and consular protection to them when they are in a foreign country," according to the State Department.

The U.S. government does not endorse dual nationality as a event of policy because of the problems it may cause. Multiple citizenship can create additional tax liability.

The U.S. Supreme Court have generally echoed traditional arguments for limiting dual citizenship, noting that dual citizenship presents serious problems both for the individuals and the government involved.


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