Question: Which country was Dora Luz's work in The Three Caballeros premiered in? 

Context paragraphs:
Machine Gun Mama: Machine Gun Mama is a 1944 American musical comedy film directed by Harold Young.  It was PRC's attempt to feature a comedy team to compete with Universal's Abbott and Costello and Paramount's Road to ... movies and their entry in the Good Neighbor Policy film genre of the time where the United States presented both a positive image to Latin and South America as well as stimulating American tourism to the region.  Harold Young had also directed the live action portions of Walt Disney's "The Three Caballeros".

Destino: Destino is an animated short film released in 2003 by The Walt Disney Company.  "Destino" is unique in that its production originally began in 1945, 58 years before its eventual completion.  The project was originally a collaboration between Walt Disney and Spanish Surrealist painter Salvador Dalí, and features music written by Mexican songwriter Armando Domínguez and performed by Mexican singer Dora Luz.  It was included in the Animation Show of Shows in 2003.

Gran Fiesta Tour Starring The Three Caballeros: Gran Fiesta Tour Starring The Three Caballeros is a musical dark boat ride housed within the pyramid-shaped Mexico Pavilion, at the Epcot theme park at the Walt Disney World Resort in Florida.  It was the first World Showcase attraction to feature Disney characters based on an existing property.  Norway followed suit in 2014 when it closed its Maelstrom ride to make room for Frozen Ever After, which opened in 2016.

Dora Luz: Dora Luz is the stage name of a Mexican singer and recording artist.  She is known for her performance in Walt Disney's "The Three Caballeros" (1944), in which she sings Agustín Lara's "You Belong to My Heart" to Donald Duck.  She also recorded "Destino", by Armando Domínguez, for Disney and Salvador Dalí's "Destino" in 1945.

Manuel Esperón: Manuel Esperón González (August 3, 1911 – February 13, 2011) was a Mexican songwriter and composer.  He wrote many songs for Mexican films, including "¡Ay, Jalisco, no te rajes! " for the 1941 film of the same name, "Cocula" for "El Peñón de las Ánimas" ("The Rock of Souls") (1943), and "Amor con amor se paga" for "Hay un niño en su futuro" (1952).  Other Esperón compositions have become Latin standards such as "Yo soy mexicano", "Noche plateada" and "No volveré", which was used in the first episode of the 2001 soap opera "El juego de la vida".  Among other performers, Chavela Vargas, Pedro Infante, Los Panchos, and Jorge Negrete have made his songs well-known.  His fame in the USA derives from when his song "The Three Caballeros" was used in the Disney film "The Three Caballeros" (1944).

The Three Caballeros Ride Again: "The Three Caballeros Ride Again" is a Disney comic by Don Rosa.

Panchito Pistoles: Panchito Pistoles is a cartoon character drawn as an anthropomorphized rooster.  He appeared in the film "The Three Caballeros".  Later he appeared in several Disney comics, including Don Rosa's "The Three Caballeros Ride Again" and "The Magnificent Seven (Minus 4) Caballeros".  Panchito was the only one of the Three Caballeros to never appear in "Saludos Amigos", as he did not yet exist when the 1942 film was released before he first appeared in the 1944 film.

José de la Luz y Caballero: José Cipriano de la Luz y Caballero (July 11, 1800 – June 22, 1862) was a Cuban scholar, acclaimed by José Martí as "the father ... the silent layer of foundations" in Cuban intellectual life of the 19th Century (see "Un magno artículo de Martí", in "Aforismos de Luz y Caballero" Havana, 1960, p. 139).  Interest in Luz's work was revived around the time of the Cuban Revolution, and new editions of his work published, as he was regarded as a source of intellectual autonomy for the country.

Saludos Amigos: Saludos Amigos (Spanish for "Greetings, Friends") is a 1942 American live-action animated package film produced by Walt Disney and released by RKO Radio Pictures.  It is the sixth Disney animated feature film and the first of the six package films produced by Walt Disney Productions in the 1940s.  Set in Latin America, it is made up of four different segments; Donald Duck stars in two of them and Goofy stars in one.  It also features the first appearance of José Carioca, the Brazilian cigar-smoking parrot.  "Saludos Amigos" was popular enough that Walt Disney decided to make another film about Latin America, "The Three Caballeros", to be produced two years later.  "Saludos Amigos" premiered in Rio de Janeiro on August 24, 1942.  It was released in the United States on February 6, 1943.  At 42 minutes, it is Disney's shortest animated feature to date.  It garnered positive reviews and was theatrically reissued in 1949, when it was shown on a double bill with the first reissue of "Dumbo".

The Three Caballeros: The Three Caballeros is a 1944 American live-action animated musical package film produced by Walt Disney and released by RKO Radio Pictures.  The film premiered in Mexico City on December 21, 1944.  It was released in the United States on February 3, 1945 and in the UK that March.  The seventh Disney animated feature film, the film plots an adventure through parts of Latin America, combining live-action and animation.  This is the second of the six package films released by Walt Disney Productions in the 1940s, following "Saludos Amigos" (1942).

Supporting paragraphs: Dora Luz The Three Caballeros
Answer: Mexico