There were several treaties signed in Montevideo.

In a treaty signed on August 27, 1828 Brazil and Argentina, after British mediation, recognized the independence of Uruguay.

The 1960 Treaty of Montevideo established the ALALC organization, the Latin American Free Trade Association. It was followed in 1980 by a treaty transforming ALALC into ALADI (Asociación Latinoamericana de Integración).