Brainliest ! theres 2 questions : ) which is the best definition of naturalization? the process of living and working in the u. s. in order to become a citizen the act of taking an oath of loyalty to the u. s. in order to become a citizen the legal steps taken for a citizen born in another country to become a u. s. citizen the classification of one who is born in another country but lives in the u. s. permanently