Answer:
That person has become assimilated.
Explanation:
In sociology, the term assimilation is the moderate process by which an individual begins to acquire beliefs and traits from a cultural group in order to become a part of this new group.
In this case, this is an unforced assimilation since it sociologists distinguished a forced one as well. The person wants to acquire beliefs of a group in order to become indistinguishable from other members, carrying out an assimilation process.