Generally one has to be a citizen of a country to hold a passport of a country. Exceptions are few, but include refugees who can be given temporary papers by a country.
People can be citizens of several countries at the same time and hold several different passports at the same time.
To get a UK passport you must be a citizen of the UK.A passport is proof of identity and proof of citizenship. Therefore you can only get a passport for a country if you are a citizen of that country (with very few exceptions).
http://travel.state.gov/law/citizenship/citizenship_781.html
In order to get a Liechtenstein passport, or that of any other country, you need to be a citizen of that country. If you are not a Liechtenstein citizen you can't get a Liechtenstein passport.
In order to get a Swedish passport you have to be a Swedish citizen. Once you are a citizen you can get the passport. That's what it means to have a passport - it shows that you are a citizen of the country in question.
Passports aren't issued by cities, they are issued by countries. In order to have a passport, you need to be a citizen of the country you are applying to. So if you are a British citizen, you get a UK passport, if you are a Canadian citizen, you get a Canadian passport. It doesn't matter where you were born, it's what country you are a citizen. If you don't have citizenship then you cannot have a passport. Ex: A Canadian citizen, who is NOT an American citizen cannot have a US passport.
Not if you are a US citizen. If you are a citizen of the country, you can travel to any place part of the country without a passport.
When you enter a country, you have to have a passport--even if you are a citizen of that country.
You need the passport of the country of which you are a citizen. You cannot have a US passport until you are a US citizen.
In order to get an Italian passport you need to be an Italian citizen. The same applies to any country's passports. That is the purpose of a passport, it is a proof of citizen. So the question is really: are you an Italian citizen? Or can you get Italian citizenship (naturalisation or because one of your parents was Italian).
Greenland is not an independent country, it does not issue passports. Greenland is part of Denmark. To get a Danish passport you need to be a Danish citizen. The same applies for any passport, you need to be a citizen of that country.
Having a passport does not necessarily make you a citizen of a particular country. Citizenship is determined by the laws of the country you were born in, the citizenship status of your parents, or through the process of naturalization. A passport is simply a travel document issued by a government to its citizens for international travel.
In order to get a German passport one must be a German citizen.