The 14th Amendment establishes that persons born in the US are citizens. National citizenship also extends to state citizenship. Naturalized citizens undergo a legal process to become citizens, while those born in the US are natural born citizens. Entire populations can also be granted citizenship through treaties or statutes. To qualify for naturalization, one must be 18, a lawful permanent resident for 5+ years, have good moral character, be committed to the US Constitution, and be able to read, write, speak, and understand English. The US recognizes dual citizenship for those born abroad to US citizens or born in other countries.