That doesn't seem to be true for India, at least.[1] People legally resident for 12 years can apply to naturalize. And spouses can just register to get citizen

That doesn't seem to be true for India, at least.[1] People legally resident for 12 years can apply to naturalize. And spouses can just register to get citizenship. 1. https://en.wikipedia.org/wiki/Indian_nationality_law#Voluntary_acquisition https://en.wikipedia.org/wiki/Indian_nationality_law#Volunta...