Arquivo Histórico Ultramarino Arquivo Histórico Ultramarino The Arquivo Histórico Ultramarino (est. 1931) of Portugal preserves archives related to the Portuguese Empire. It is located in the on da Boa-Hora in the city of Lisbon, near the in the parish of Alcântara. The of the governmental Ministry of Science, Technology and Higher Education administers the archives. Prior to 1973, the Overseas Ministry oversaw it. Among its holdings are records created in 15th-20th century related to colonial Angola, Brazil, Cape Verde, Guinea, India, Macau, Mozambique, São Tomé and Príncipe, Timor, Uruguay, and other locales. As of 1970 the materials were grouped as pre-1833 (mostly from
Brazil–Uruguay relations Uruguay) with the intention of destroying the "Liga Federal". The Brazilian forces, thanks to their numerical and material superiority, occupied Montevideo on January 20, 1817, and after struggling for three years in the countryside, defeated Artigas in the Battle of Tacuarembó. In 1821, the "Banda Oriental", was annexed by Brazil under the name of "Província Cisplatina". In response, the Thirty-Three Orientals, led by Juan Antonio Lavalleja, declared independence from Brazil on August 25, 1825, supported by the United Provinces of the Río de la Plata (present-day Argentina). This led to the 500-day Cisplatine War. Neither side gained the upper hand,