THE POLITICAL PARTIES
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Bipartism - The military coup of 1964 began the fifth phase and brought the bipartism, which would have come, according to some accounts, from President Castello Branco's naive admiration for the British model; according to others, though, it was a "mexicanization" of the system, which would make the ARENA the Brazilian project of a future PRI (Institutional Revolutionary Party). The "subparties" (in Portuguese sublegendas) were copied from the Uruguayan model, i.e. a mechanism used to accommodate internal differences within the two parties, ARENA and MDB.