The Constitution of the Argentine Nation (Spanish: Constitución de la Nación Argentina) is the basic governing document of Argentina, and the primary source of existing law in Argentina. Its first version was written in 1853 by a constitutional assembly which gathered in Santa Fe; the doctrinal basis was taken in part from the United States Constitution. It was then reformed in 1860, 1866, 1898, 1949, 1957 (which mainly repealed the 1949 reform), and the current version is the reformed text of 1994. The Argentine Constitution consists of a preamble and two normative parts: