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.
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.
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.
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).
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.
Usually your passport depends on your citizenship. If you are a citizen of your country, lets say the USA then you have a US passport. You can also have a dual passport, depending on your citizenship again. You might be a naturalized citizen in one country and a citizen by birth in another. Sometimes, people working for the United Nations or a related organization may have passports issued by the UN.