The Mexican constitution not only recognizes the 62 indigenous peoples living in Mexican territory but also grants them autonomy and protects their culture and languages. This protection and autonomy is extended to those Amerindian ethnic groups which have migrated from the United States — like the Cherokees and Kickapoos — and Guatemala during the 19th and 20th centuries. Municipalities in which indigenous peoples are located can keep their normative traditional systems in relation to the election of their municipal authorities. This system is known as "Usos y Costumbres", roughly translated as "customs and traditions".