Naturalization is the process by which U.S. citizenship is granted to a lawful permanent resident after meeting the requirements established by Congress in the Immigration and Nationality Act (INA). Acquisition of citizenship is obtained through U.S. citizenship parents either at birth or after birth, but before the age of 18. More @Wikipedia
Hover over any link to get a description of the article. Please note that search keywords are sometimes hidden within the full article and don't appear in the description or title.