NATURALIZE – to grant full citizenship to one of foreign birth
Merriam-Webster Online Dictionary
naturalize (verb)transitive verb
1.
to confer the rights of a national on , especially to admit to citizenship
2.
to introduce into common use or into the vernacular
3.
to bring into conformity with - nature
4.
intransitive verb
to cause (as a plant) to become established as if native to become established as if native