Montevideo was founded by the Spanish in the early 18th century as a military stronghold; its natural harbor soon developed into a commercial center competing with Argentina's capital, Buenos Aires. Uruguay's early 19th century history was shaped by ongoing conflicts between the British, Spanish, Portuguese, and colonial forces for dominance in the Argentina-Brazil-Uruguay region. In 1811, Jose Gervasio Artigas, who became Uruguay¥s national hero, launched a successful revolt against Spain. In 1821, the Provincia Oriental del Rio de la Plata, present-day Uruguay, was annexed to Brazil by Portugal. The Provincia declared independence from Brazil in August 25, 1825 (after numerous revolts in 1821, 1823, and 1825) but decided to adhere to a regional federation with Argentina.

The regional federation defeated Brazil after a 3-year war. The 1828 Treaty of Montevideo, fostered by the United Kingdom, gave birth to Uruguay as an independent state. The nation's first constitution was adopted in 1830. The remainder of the 19th century, under a series of elected and appointed presidents, saw interventions by neighboring states, political and economic fluctuations, and large inflows of immigrants, mostly from Europe. Jose Batlle y OrdoÒez, president from 1903 to 1907 and again from 1911 to 1915, set the pattern for Uruguay's modern political development. He established widespread political, social, and economic reforms such as a welfare program, government participation in many facets of the economy, and a plural executive. Some of these reforms were continued by his successors.

By 1966, economic, political, and social difficulties led to constitutional amendments, and a new constitution was adopted in 1967. In 1973, amid increasing economic and political turmoil, the armed forces closed the Congress and established a civilian-military regime, characterized by repression and widespread human rights abuses. A new constitution drafted by the military was rejected in a November 1980 plebiscite. Following the plebiscite, the armed forces announced a plan for return to civilian rule. National elections were held in 1984. Colorado Party leader Julio Maria Sanguinetti won the presidency and served from 1985 to 1990. The first Sanguinetti administration implemented economic reforms and consolidated democracy following the country's years under military rule.

Sanguinetti's economic reforms, focusing on the attraction of foreign trade and capital, achieved some success and stabilized the economy. In order to promote national reconciliation and facilitate the return of democratic civilian rule, Sanguinetti secured public approval by plebiscite of a controversial general amnesty for military leaders accused of committing human rights violations under the military regime, and sped the release of former guerrillas.

The National Party's Luis Alberto Lacalle won the 1989 presidential election and served from 1990 to 1995. Lacalle executed major structural economic reforms and pursued further liberalization of the trade regime. Uruguay became a founding member of MERCOSUR in 1991 (the Southern Cone Common Market, which includes Argentina, Brazil and Paraguay). Despite economic growth during Lacalle's term, adjustment and privatization efforts provoked political opposition, and some reforms were overturned by referendum.

In the 1994 elections, former President Sanguinetti won a new term, which ran from 1995 until March 2000. As no single party had a majority in the General Assembly, the National Party joined with Sanguinetti's Colorado Party in a coalition government. The Sanguinetti government continued Uruguay's economic reforms and integration into MERCOSUR. Other important reforms were aimed at improving the electoral system, social security, education, and public safety. The economy grew steadily for most of Sanguinetti's term, until low commodity prices and economic difficulties in its main export markets caused a recession in 1999, which continued into 2003.

The 1999 national elections were held under a new electoral system established by constitutional amendment. Primaries in April decided single presidential candidates for each party, and national elections on October 31 determined representation in the legislature. As no presidential candidate received a majority in the October election, a runoff was held in November. In the runoff, Colorado Party candidate Jorge Batlle, aided by the support of the National Party, defeated Frente Amplio candidate TabarÈ V·zquez.

The legislative coalition of the Colorado and National parties that held during most of Batlle¥s administration ended in November 2002, when the Blancos withdrew their ministers from the cabinet. Throughout most of his administration, President Batlle had to handle Uruguay¥s largest economic crisis in recent history, which impacted on poverty and led to increased emigration. Aside from successfully addressing the crisis, Batlle increased international trade, attracted foreign investment and tried to resolve issues related to Uruguayans who disappeared during the military government.

On June 27, 2004 the parties held primary elections to select their candidates for the national elections to be held on October 31. The Frente Amplio had already determined that V·zquez would be its candidate, the Colorados settled on former Interior Minister Guillermo Stirling, and the Blanco Party chose Jorge Larranaga, a former state governor and senator. V·zquez won the national election in the first round with a majority of the popular vote (50.7%) and was sworn in as President on March 1, 2005.