The present work focuses on the complex bilateral integration process involving Brazil and Argentina that began formally during the 80's, and displayed in its double scope: a) pacific cooperation on nuclear technology; b) constitution of a common market. This process evolution took place in three fundamental circles: the first one, approximation antecedents; the second one, decisive instruments for a large integration; and the third one, the solidification of two basis, one at the nuclear technological level, joining the two countries in the sui generis back up system and the operation of the Tlatelolco Treaty, the other, at the economic level instituting the Mercosur by the Asunción Treaty.
Brazil; Argentina; Nuclear technology; Conflict; Integration