No. Denmark does not allow Dual Citizenship unless one acquires two nationalities automatically at birth (for example a Danish mother having a child on US soil).
Dual citizenship has been allowed in Brazil since 1994.
Yes dual citizenship is allowed for US citizens.
Dual citizenship (or dual nationality) is allowed in the UK. Many countries don't accept dual citizenship, so you would have to make specific inquiries.
Spain does not have dual citizenship agreement with the US.
Dual citizenship or dual nationality is allowed in the UK. This means you can be a British citizen and also a citizen of another country. Not every country will grant dual citizenship.
In 1964 Dual citizenship is severely restricted in Malta therefore the previous births will follow that rules and must have not the dual citizenship, it would be the American. In 1989 when the Malta citizenship became allowed at birth then again it was only to those infants whose parents have Maltian citizenship or born in Malta, So in both situation they do not allow dual citizenship to a baby for American couple.
No.
The US recognizes dual citizenship.
Yes. Citizenship is not lost unless your mother chose another country of citizenship after she became over 18. Adults are not allowed dual citizenship.
India does not allow dual citizenship.
Yes, Thailand allows dual citizenship.
Dual citizenship is when one has citizenship rights in two countries.