What countries allow a dual citizenship

Question

which of these allow an american under age 18 without blood relation to get a dual citizenship?

Answer 1

Which of what? No countries listed :o)

Answer 2

I think you left out a selection of countries to choose from.

Australia and India encourage and allow dual citizenship, but i think you have to be 18!

Answer 3

I know for sure that India does.  Several European countries like GB, Germany, and France also allow.  I'm not sure about 18 year olds, but I know alot of adults with dual citizenships.