Uruguay adopted its first constitution in 1830, following the conclusion of a three-year war in which Argentina and Uruguay fought as a regional federation: the United Provinces of the Río de la Plata. Sponsored by the United Kingdom, the 1828 Treaty of Montevideo built the foundations for a Uruguayan state and constitution. A constitution proposed under the military dictatorship government was rejected by a referendum in 1980.thumb|Executive Tower seats the executive power.
Uruguay adopted its first constitution in 1830 following the conclusion of a three-year war in which Argentina and Uruguay fought as a regional federation: the United Provinces of the Río de la Plata. Sponsored by the United Kingdom, the 1828 Treaty of Montevideo built the foundations for a Uruguayan state and constitution. A constitution proposed under the military dictatorship government was rejected by a referendum in 1980thumb|Executive Tower seats the executive power.