 On 20 December 1933 a Legal Status of Border was established and on 21 July 1972 bilateral notices were exchanged about the waterfront borders at the height of the mouth of the creek Chuy.On 14 January 1938, the status of Chui was elevated to "Pueblo" (village) by the Act of Ley Nº 9.758.On 29 June 1961, it was elevated to "Villa" (town) by the Act of Ley Nº 12.887, and on 11 December 1981, it was further elevated to "Ciudad" (city) by the Act of Ley Nº 15.227.