Matthew Gray Gubler is a citizen of the United States of America since his naturalization in 2005.
The United States has a federal system in which a person is a citizen of their specific state of residence, such as New York or California, as well as a citizen of the United States
 However, the act still contained restrictions regarding who was eligible for US citizenship and retained a national quota system which limited the number of visas given to immigrants based on their national origin, to be fixed "at a rate of one-sixth of one percent of each nationality's population in the United States in 1920"

