If you hold German citizenship, whether dual or not, then there are no occupancy requirements.
You can apply for dual citizenship to the USA and almost any other country. Many more people than you might think hold dual citizenship. But the road to dual citizenship, with only a few exceptions, is long, twisting and full of "gotchas".
Yes, as long as you are not a defector.
Since you have British citizenship, for an unlimited period of time.
Being already a Filipino citizen because of Dual Citizenship, You can stay as long as you like.
As long as said person has a citizenship in Mexico, they should be able to stay for as long as they want. However, it may be wise to get an identification card, but it shouldn't be needed.
Generally, as long as you want. Some counties (UK for example) allow citizenship to be revoked by the government unilaterally (i.e. they think you're a terrorist, and you have citizenship in another country. Cannot lose U.S. citizenship unless you revoke it, in person, outside the U.S. at an embassy.
For as long as your visa is valid, unless you hold German citizenship.
As long as you are living in Canada and have citizenship you qualify for health care.
If you have Brazilian citizenship, you MUST enter and depart Brazil with a valid Brazilian passport. With a Brazilian passport, you can stay there as long as you want..
If you are an Italian citizen you can live in Italy whenever you like as long as you like, regardless of your other citizenships.
No. The fact is that anyone who is born on American soil is by definition an American citizen. Since Barack Obama was born in Hawai'i, which was a State of the United States at the time of his birth, Barack Obama holds American citizenship and is a native-born American by any legal definition. President Obama has never had dual citizenship, but dual citizenship is not an automatic disqualification under the Constitution for the presidency so long as one is a native-born American. However, since Barack Obama has never had dual citizenship of any kind, this principle does not apply to him in any case.
It's important to note that while your dual citizenship may be recognized by another country, the US does not recognize dual citizenship. For Immigration purposes, this means that you cannot travel to the US on a foreign passport if you are a US citizen. == == The US laws on dual citizenship are somewhat ambigious. The US law states that you remain a citizen unless you a)Voluntarily apply for citizenship of another country with B) the intention of renouncing your US citizenship. So, for example, if you are a US citizen by birth, you may become a naturalized citizen of Canada. Canada does not require renouncing other citizenships, so you remain a citizen of both countries. If you are a citizen of the UK, their laws would determine if you can retain your citizenship after becoming a naturalized citizen of the US. Basically, becoming a naturalized citizen of country A may not automatically eradicate your citizenship in country B, depending on the laws of country B. Some countries, such as Iraq, require you to renounce all other citizenships. There is a long list of countries that do not allow dual citizenships (do a google search.) If you specifically want to renounce your US citizenship, you do so by filling out a form and filing it with the US embassy.