The rules of Dual Citizenship are quite easy to understand. Most countries neither deny or recognizes dual citizenship. However, if you are a dual citizen you must enter the country with the country's passport you own.
No, it's South Korea that does not allow dual citizenship.
Yes, Portugal and Canada both allow multiple citizenship.
No only Chinese citizenship
Nationality, or citizenship as in dual citizenship [double nationalite, or double citoyennete].
He must serve.
Yes, Poland allows dual citizenship.
Yes, it is possible to have dual citizenship in both Poland and the USA.
India does not allow dual citizenship.
Yes, Thailand allows dual citizenship.
Yes, Venezuela allows dual citizenship.
Dual citizenship has been allowed in Brazil since 1994.
No, it's South Korea that does not allow dual citizenship.
Yes, it does.
Yes, Uruguay allows dual citizenship, meaning individuals can hold citizenship in Uruguay and another country simultaneously.
Israel allows dual citizenship for those who immigrate to Israel based on Law of Return (aliyah): you have to be Jewish to qualify to hold dual citizenship in Israel.
Liberia
Yes, both countries allow dual citizenship. However, if you live more than ten years outside Ireland, you will lose your Irish citizenship.