It depends on the country and the situation. Some countries require that you give up one of your citizenships. Also, if you have citizenship of a country that requires you live (or at least return) for a set period of time (as in you visit at least once a year or live there for a certain number of years per number of years you live outside of the country) and you live outside of said country for too long, you may lose citizenship (note: some citizenships allow that you live outside of the country indefinitely).
Not unless you renounce your Canadian citizenship voluntarily.
no you won't, you will have a dual citizenship which ok, but you can't swear to both countries
He will become a dual citizen of the uK and the US.
Yes, both countries allow dual citizenship. However, if you live more than ten years outside Ireland, you will lose your Irish citizenship.
If you apply for citizenship in another country your US citizenship is automatically revoked. The US does not recognize dual citizenship. You revoke it in writing at a US embassy, outside the US.
Typically the child will have dual citizenship until they reach the age of 18, at which point they have to determine which citizenship they were going to go with.
No.
The US recognizes dual citizenship.
India does not allow dual citizenship.
Yes, Thailand allows dual citizenship.
Canada does not allow dual citizenship solely based on bilateral agreements (like the way Spain does with Spanish South American countries, Philippines, and Portugal). Therefore, if you become a Canadian citizen and you are from a country that does not allow dual citizenship, you may lose your original nationality because of the laws of that country, not Canada.
Dual citizenship is when one has citizenship rights in two countries.