 Chile is a founding member of the United Nations, the Community of Latin American and Caribbean States (CELAC) and the Pacific Alliance, and joined the OECD in 2010.There are various theories about the origin of the word "Chile".According to 17th-century Spanish chronicler Diego de Rosales, the Incas called the valley of the Aconcagua "Chili" by corruption of the name of a Picunche tribal chief ("cacique") called "Tili", who ruled the area at the time of the Incan conquest in the 15th century.