Justo José de Urquiza y García ( October 18 is the 291st day of the year (292nd in Leap years). ...October 18, Events January 1 _ Legislative union of Ireland completed under the Act of Union 1800, bringing about the United Kingdom of Great Britain and Ireland. ...1801 _ April 11 is the 101st day of the year in the Gregorian calendar (102nd in leap years). ...April 11, 1870 was a common year starting on Saturday (see link for calendar). ...1870) was an Argentina is a country in southern South America, situated between the Andes in the west and the southern Atlantic Ocean in the east. ...Argentine general and politician. He was president of the confederation from Events January 13 _ The accordion is patented by Anthony Faas. ...1854 to 1860 is the leap year starting on Sunday. ...1860.

As the Caudillo is a Spanish (caudilho in Portuguese) word designating a politico_military leader at the head of an authoritative power. The related caudillismo is a cultural phenomenon that first appeared during the early 19th century in revolutionary South America, as a type of militia leader with a charismatic personality and...caudillo of Entre Ríos, Urquiza helped sustain the power of Juan Manuel José Domingo Ortiz de Rosas y López de Osornio (born Juan Manuel Ortiz de Rozas, 1793-1877) was a conservative Argentinian politician who ruled Argentina from 1829 to 1852. ...Manuel de Rosas. In 1851, resentful of the economic and political dominance of Buenos Aires (Good Winds in Spanish, but more akin to Fair Winds, as in navigation) is the capital of Argentina and its largest city and port, as well as one of the largest cities in South America. ...Buenos Aires, he revolted against his chief. Supported by The Federative Republic of Brazil (República Federativa do Brasil in Portuguese) is the largest and most populous country in South America, and fifth largest in the world. ...Brazil and the The Republic Eastern of the Uruguay (Spanish: República Oriental del Uruguay), is a Spanish speaking country located in southern South America. ...Uruguayan liberals, he forced Manuel Oribe (1792 _ 1857) was a Uruguayan political figure. ...Manuel Oribe to capitulate, ending the long siege of Montevideo, Minnesota, Montevideo is the capital, chief port and largest city in Uruguay (population 1. ...Montevideo in October 1851, finally defeating Rosas in February 1852.

Urquiza immediately began the task of national organization. He became provisional director of the Argentine confederation in May, 1852. A A Constituent Assembly is a body elected with the express and limited purpose of drafting, and in some cases, adopting a constitution. ...constituent assembly adopted (1853) a constitution based primarily on the ideas of Juan Bautista Alberdi (29 August 1810_19 June 1884) was a Argentian political theorist and diplomat. ...Juan Bautista Alberdi, and Urquiza was inaugurated president in March 1854.

During his administration, foreign relations were improved, public education was encouraged, colonization was promoted, and plans for railroad construction were initiated. His work of national organization was, however, hindered by the opposition of Buenos Aires, which seceded from the confederation. Open war broke out in 1859. Urquiza defeated the provincial army led by Bartolomé Mitre in October 1859, and Buenos Aires agreed to re-enter the confederation.

Constitutional amendments proposed by Buenos Aires were adopted in 1860 but the settlement was short-lived, and further difficulties culminated in civil war. Urquiza met the army of Buenos Aires, again led by Mitre, September 1861. The battle was indecisive, but Urquiza withdrew from the field, leaving the victory with Mitre. He retired to Entre Ríos, where he ruled until he was assassinated at age 69 (along with his sons Justo and Waldino) by followers of dissident and political rival Ricardo López Jordán.