Brazil–Uruguay relations encompass many complex relations over the span of three centuries, beginning in 1680 with the establishment of the Colónia do Sacramento, to the present day, between the Federative Republic of Brazil and the Oriental Republic of Uruguay. Brazil and Uruguay are neighbouring countries in South America, and share close political, economic and cultural ties. The singularity of the bilateral relationship between the two countries originates from a strong historical connection, as both countries having been territories of the Portuguese Empire and sharing the same language – marked by important events, such as the establishment of the Colónia do Sacramento in 1680, the invasion of the Banda Oriental by Brazil in 1815 and the subsequent creation of the Província Cisplatina, and Uruguay's independence from Brazil in 1828. The bilateral relationship was further defined by the Uruguayan Civil War (1839–1851) and the Paraguayan War (1864–1870). Relations during the late-19th to late-20th centuries were overshadowed by domestic politics and resulted in a period of distancing between the two countries. The signing of the Treaty of Asunción in 1991 initiated a period of closer political, economical and cultural ties. Today, the Brazilian government defines Uruguay as a strategic ally and places the bilateral relationship as a foreign policy priority. This is met with reciprocity by Montevideo. Uruguay has supported the Brazilian bid for a permanent seat at the United Nations Security Council. History Colonization The Spanish arrived in the territory of present-day Uruguay in 1516, but the indigenous people's fierce resistance to conquest, combined with the absence of gold and silver, limited settlement in the region during the 16th and 17th centuries. Uruguay became a zone of contention between the Spanish and the Portuguese empires. In 1603 the Spanish began to introduce cattle, which became a source of wealth in the region. The first permanent settlement on the territory of present-day Uruguay was founded by the Spanish in 1624 at Soriano on the Río Negro. In 1669–71, the Portuguese built a fort at the banks of the Río de la Plata. Founded in 1680 by Portugal as Colónia do Sacramento, the colony was later disputed by the Spanish who settled on the opposite bank of the river at Buenos Aires. The colony was conquered by José de Garro in 1680, but returned to Portugal the next year. It was conquered again by the Spanish in March 1705 after a siege of five