The Inca plan was a proposal formulated in 1816 by Manuel Belgrano to the Congress of Tucumán, aiming to crown an Inca. After the Declaration of Independence of the United Provinces of South America (modern Argentina), the Congress discussed the form of government that should be used. Belgrano proposed that the country be ruled by a Constitutional monarchy headed by an ethnic Inca. The proposal was supported by José de San Martín, Martín Miguel de Güemes and the northern provinces, but found strong resistance from Buenos Aires. The Congress would ultimately reject it, creating instead a Republican government.