Apply at the nearest embassy or consulate of your country of citizenship.
*Your case would not be approved usually if you do not have another citizenship.
No - citizenship is not transferable from one person to another !
Yes only if that person is a American applying for dual citizenship in Brazil. A person from Brazil would be unable to keep citizenship in Brazil if they wanted US citizenship. because the US requires you to give up your citizenship to all other countries except Canada citizenship.
No, you do not have to give up dual citizenship in order to join the military.
Hi, if you are born in a country you get a citizenship of that country ( that is single citizenship). If you migrate to another country and get a citizenship from that country but you do not want to give up the citizenship of your home country then it is a dual citizenship.
If you "renunciate" something, you give it up.
expatriation
No, a former president cannot give up their citizenship. Once someone is a citizen of a country, they retain that citizenship unless they voluntarily renounce it through a formal process. Being a former president does not exempt someone from the normal rules and procedures regarding citizenship.
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.
give up your Indian citizenship
Mark Zuckerberg did not renounce his US citizenship. He did, however, give up his US citizenship while acquiring citizenship in other countries to avoid double taxation on his assets.
It depends where his parents are from. If a child has US citizenship,the US does not require him to give up the US citizenship ever. But, let's say the parents are from Japan, government of Japan requires him to choose between Japanese or American nationality and give up one of them.
It's sort of hard. :)