The Argentine War of Independence was fought from 1810 to 1818 by Argentine patriotic

Patriot (Spanish American Revolution)

Patriots was the name the peoples of the Spanish America, who rebelled against Spanish control during the Spanish American wars of independence, called themselves. They supported the principles of the Age of Enlightenment and sought to replace the existing governing structures with Juntas...

 forces under Manuel Belgrano

Manuel Belgrano

Manuel José Joaquín del Corazón de Jesús Belgrano , usually referred to as Manuel Belgrano, was an Argentine economist, lawyer, politician, and military leader. He took part in the Argentine Wars of Independence and created the Flag of Argentina...

, Juan José Castelli

Juan José Castelli

Juan José Castelli was an Argentine lawyer. He was one of the leaders of the May Revolution, which started the Argentine War of Independence...

 and José de San Martín

José de San Martín

José Francisco de San Martín, known simply as Don José de San Martín , was an Argentine general and the prime leader of the southern part of South America's successful struggle for independence from Spain.Born in Yapeyú, Corrientes , he left his mother country at the...

 against royalist forces loyal to the Spanish crown

Spanish Empire

The Spanish Empire comprised territories and colonies administered directly by Spain in Europe, in America, Africa, Asia and Oceania. It originated during the Age of Exploration and was therefore one of the first global empires. At the time of Habsburgs, Spain reached the peak of its world power....

. On July 9, 1816, an assembly

Congress of Tucumán

The Congress of Tucumán was the representative assembly, initially meeting in Tucumán, that declared the independence of the United Provinces of South America on July 9, 1816, from the Spanish Empire....

 met in San Miguel de Tucumán, declared full independence

Argentine Declaration of Independence

What today is commonly referred as the Independence of Argentina was declared on July 9, 1816 by the Congress of Tucumán. In reality, the congressmen that were assembled in Tucumán declared the independence of the United Provinces of South America, which is still today one of the legal names of the...

 with provisions for a national constitution

Constitution of Argentina

The constitution of Argentina is one of the primary sources of existing law in Argentina. Its first version was written in 1853 by a Constitutional Assembly gathered in Santa Fe, and the doctrinal basis was taken in part from the United States Constitution...

.
The territory of modern Argentina was part of the Spanish Viceroyalty of the Río de la Plata

Viceroyalty of the Río de la Plata

The Viceroyalty of the Río de la Plata, , was the last and most short-lived Viceroyalty of the Spanish Empire in America.The Viceroyalty was established in 1776 out of several former Viceroyalty of Perú dependencies that mainly extended over the Río de la Plata basin, roughly the present day...

, with the same capital city in Buenos Aires, seat of government of the Spanish viceroy

Viceroy

A viceroy is a royal official who runs a country, colony, or province in the name of and as representative of the monarch. The term derives from the Latin prefix vice-, meaning "in the place of" and the French word roi, meaning king. A viceroy's province or larger territory is called a viceroyalty...

.