It isn't. Voting is an option.
If you hold a green card and are in the US, you should apply for a travel document. Contact the INS so that they can assist you to apply for US citizenship.
You have the right to enter Canada if you are a Canadian citizen. The passport should prove your identification, and the citizenship card should prove your citizenship - my guess is a strong yes.
As a citizen, you should vote and support your country. There is little else you can do
It is most likely "unilateral marriage fraud." That means that the fraud was committed completely on the part of the alien while your sister was married in good will. Yes, this is illegal. Could he have his citizenship revoked for this? Yes, because he obtained it through fraud. What is the likelihood of it actually happening? VERY SMALL. Your sister should write a letter to USCIS explaining everything. She should also call or write her congressman's office. * Yes. If within two years of becoming a citizen the USCIS finds that the person acquired citizenship through misrepresentation, then administrative revocation can take place. If the time limit of two years has expired the government must file suit in federal court to have the person "de-naturalized". *If a US citizen renounces his citizenship at a US Embassy overseas and then becomes a citizen of the foreign country, the US government will try to take away his US citizenship legally. Other countries will revoke citizenship if the person becomes a citizen of another country. This is hypocrisy since many countries claim that their people are still citizens even if they are born in another country,as long as one of the parents is a citizen by birth. Many people have dual nationalities and two passports which they use regularly. Jews born outside of Israel are an example where regardless of where they were born, they have the right to ask for and be granted citizenship in Israel without a lengthy wait.
Only if the other country does not ask you to renounce your US citizenship (e.g. Norway, Denmark, Spain and Luxembourg require you to renounce your US citizenship if you want to obtain their citizenship).
Anyone who is a citizen of the Vatican maintains their original citizenship of their country of origin. Should they lose their Vatican citizenship they revert to their original nationality or, lacking that, automatically become Italian citizens.
They should be able to through an American Embassy.
S/He should file for citizenship. Try asking the local municipality for the proceedings.
Yes it is allowed. If you obtain Canadian citizenship, you are allowed to maintain your American citizenship as well. But you should always carry both their passports when traveling between the two.
Absolutely. The child can become a US citizen through its parents who are US citizens. The child has to apply for citizenship by filing in Form N-600 to obtain the certificate of citizenship. The child should be under 18 years of age in order to document their citizenship status. Even if the child was born outside the US, it will become a US citizen though its US citizen parents.
http://travel.state.gov/law/citizenship/citizenship_781.html
The most important duty of a citizen is to be loyal and devoted to his/her country in any circumstance. The citizen should abide by the legal system of the country, respect and uphold the principles of the constitution. The citizen should not act in a way that will be against its laws.