The 1000 km Buenos Aires was an endurance sports car event held in Buenos Aires, Argentina.
 The race mostly run on the Autódromo Oscar Alfredo Gálvez, although it would run the Costanera circuit in 1957.
 Besides a single race in Caracas, Venezuela, it was the only annual South American race in the history of the World Sportscar Championship.
The 1955 1000 km Buenos Aires took place on 23 January, on the Autódromo Municipal-Avenida Paz, (Buenos Aires, Argentina).
 It was the second running of the race, and once again, it was opening round of the F.I.A. World Sports Car Championship.
 For this event, a longer section of the Autopista General Pablo Riccheri route was added, making the circuit 17.136 km in length.
The Autódromo de Buenos Aires Juan y Oscar Gálvez (official name) is a 45,000 capacity motor racing circuit in Buenos Aires, Argentina built in 1952 under president Juan Perón, named "Autódromo 17 de Octubre" after the date of Loyalty Day until Perón's overthrow.
 It was later renamed after Argentinian racing driver brothers, Juan Gálvez and Oscar Alfredo Gálvez.
The Circuito Costanera (commonly known as the Costanera Circuit), was a Grand Prix circuit in Buenos Aires (Argentina).
 Two variants are known to have existed under Circuito "Avenida" Costanera and Costanera "Sur" which are listed by a few data sources as circuits used for the 1930, 1932 and 1936 Buenos Aires races.
 Verifiable records can only confirm the Costanera Norte circuit layouts for the 1951 V Gran Premio General Perón (Feb. 18), V Gran Premio Eva Perón (Feb. 25), Gran Premio Eva Perón (Ciudad) Sport (March 18) and the 1957 1000 km de Buenos Aires.
The 1956 1000 km Buenos Aires took place on 29 January, on the Autódromo Municipal-Avenida Paz, (Buenos Aires, Argentina).
 It was the third running of the race, and once again, it was opening round of the F.I.A. World Sports Car Championship.
 For this event, a longer section of the Autopista General Pablo Riccheri route was removed, returning the circuit to 9.476 km in length, as it was in 1954.
The 1957 1000 km Buenos Aires took place on 20 January, on the Circuito de la Costanera Norte, (Buenos Aires, Argentina).
 It was the fourth running of the race, and once again, it was opening round of the F.I.A. World Sports Car Championship.
 For this event, was moved from its previous venue, the Autódromo Municipal-Avenida Paz, only to return to the Autódromo in 1958.
The 1958 1000 km Buenos Aires took place on 26 January, on the Autódromo Municipal-Avenida Paz, (Buenos Aires, Argentina).
 It was the fifth running of the race, and once again, it was opening round of the F.I.A. World Sports Car Championship.
 For this event, it returned to the Autódromo, after having a one-off race at the Circuito de la Costanera Norte, however its layout was not generally well received.
The 1960 1000 km Buenos Aires took place on 31 January, on the Autódromo Municipal-Avenida Paz, (Buenos Aires, Argentina).
 It was the sixth running of the race, and after a year off, it returned to be the opening round of the F.I.A. World Sports Car Championship.
 However, this was to be last time to race was held until a non-championship race was held in 1970
The Buenos Aires Grand Prix was a motor race held in Buenos Aires, Argentina.
 The event was first held at the Costanera circuit from the early 1930s until 1936 and then continued in 1941 at the Retiro circuit.
 After a six-year break and General Juan Peron in office, racing resumed at Retiro in 1947 with the start of the South American "Temporada" Grand Prix series to be contested twice a year under Formula Libre regulations.
 Italian Luigi Villoresi won all 1947 Temporada events.
 The race regularly attracted Brazilian and European drivers and also Argentine drivers such as Juan Manuel Fangio and José Froilán González were now competing in Europe on a regular basis.
 For the 1948 Grand Prix season, the race was moved to the Palermo circuit where it would remain to host six of twelve "Peron Cup" races until the end of 1950.
 In 1951, the Costanera Norte circuit would host its last three Grand Prix events before the 1951 completion of the Autodromo 17 de Octubre (October 17), a purpose-built circuit for major Grand Prix series which would host various editions of the Buenos Aires Grand Prix from 1952 until 2009 with the exception of the 1956 event held at the General San Martin circuit in Mendoza.
The 1954 1000 km Buenos Aires was a motor race for sports cars which was held on January 24 at the Autódromo Municipal-Avenida Paz, (Buenos Aires, Argentina).
 It was the opening race of the 1954 World Sportscar Championship and was also the inaugural 1000 km Buenos Aires.
 The race was won by Giuseppe Farina and Umberto Maglioli, driving a Ferrari 375 MM

Question: The 1957 1000 km Buenos Aires took place on 20 January, on the Circuito de la Costanera Norte, for this event, was moved from its previous venue, the Autódromo Municipal-Avenida Paz, a 45,000 capacity motor racing circuit in Buenos Aires, Argentina built in which year?
Answer: 1952