Yes. If you are a US Citizen, you need a passport to travel anywhere outside the USA. This typically applies to all other nations as well.
hahaha northern Ireland is tiny. Most states in the US are bigger than it.
Yes - the Northern Hemisphere security initiative means even Americans need a passport To enter the US. Puerto Ricans, Canadians and Mexicans all do so too.
In the UK, and also Europe since October 1998, children have needed their own passport and can no longer travel under their parents passports.In most other countries it is highly recommended that children have their own passports.If children are under the age of 18 they do not need a passport, for Ireland, however you will need their birth certificate. Anyone over the age of 18 will need a passport for Ireland.
According to travel.state.gov your US passport must be good for 6 months after your entry date into Ireland. From the information you provided it looks like you need to renew.
Since Ireland and Portugal are both members of the European Union, they no longer require passports for travellers between those two countries. If, however, you happen to be a visitor from the US who is presently in Ireland but planning to visit Portugal, then you still need a passport, and you should not try to travel on an expired passport. Visit the American embassy and renew your passport.
US citizenship.
You'll need a US PASSPORT to return to the US.
You Don't. You need to have a passport in order to have a passport number.
No you do not need a passport to travel from the us to puerto rico. you do need a visa.
You need a passport to go anywhere.
No, but you will need a passport to get back into the US.