Juscelino Kubitschek, president of Brazil from 1956 to 1961, ordered Brasilia's construction, fulfilling the promise of the Constitution and his own political campaign promise. Building Brasilia was part of Juscelino's "fifty years of prosperity in five" plan. Already in 1892, the astronomer Louis Cruls, in the service of the Brazilian government, had investigated the site for the future capital. Lúcio Costa won a contest and was the main urban planner in 1957, with 5550 people competing. Oscar Niemeyer was the chief architect of most public buildings, Joaquim Cardozo was the structural engineer, and Roberto Burle Marx was the landscape designer. Brasilia was built in 41 months, from 1956 to April 21, 1960, when it was officially inaugurated.