The War of Independence of Brazil, also known as the Brazilian War of Independence, was waged between the newly independent Brazilian Empire and the United Kingdom of Portugal, Brazil and the Algarves, which had just undergone the Liberal Revolution of 1820. It lasted from February 1822, when the first skirmishes took place, to March 1824, with the surrender of the Portuguese garrison in Montevideo.

The war was fought on land and sea and involved both regular forces and civilian militia. Land and naval battles took place in the territories of Bahia, Cisplatina and Rio de Janeiro provinces, the vice-kingdom of Grão-Pará, and in Maranhão and Pernambuco, which today are part of Ceará, Piauí and Rio Grande do Norte states. In 1820, the Constitutionalist Revolution erupted in Portugal. The movement initiated by the liberal constitutionalists resulted in the meeting of the Cortes (or Constituent Assembly), that would have to create the kingdom's first constitution. The Cortes at the same time demanded the return of King Dom John VI, who had been living in Brazil since 1808, who elevated Brazil to a kingdom as part of the United Kingdom of Portugal, Brazil and the Algarves in 1815 and who nominated his son and heir prince Dom Pedro I as regent, to govern Brazil in his place on March 7th, 1821. The king left for Europe on April 26th, while Dom Pedro remained in Brazil governing it with the aid of the ministers of the Kingdom (Interior) and Foreign Affairs, of War, of Navy and of Finance.

Fights between Portuguese soldiers and local militias broke out in the streets of the main cities in 1822 and quickly spread inland, despite the arrival of reinforcements from Portugal. Fights between Portuguese soldiers and local militias broke out in the streets of the main cities in 1822, and quickly spread inland, despite the arrival of reinforcements from Portugal. The Portuguese military defeat was not followed by swift recognition of Brazil's independence. From 1822 to 1825 the Portuguese Government engaged in heavy diplomatic efforts to avoid the recognition of Brazil's independence by the European Powers, invoking the principles of the Congress of Vienna and subsequent European alliances. In 1824, in the wake of the adoption of the Constitution of the Empire of Brazil on March 25, the United States of America became the first nation to recognize the independence of Brazil.

For Portugal, use Brave New World's Maria I: https://civilization-v-customisation.fandom.com/wiki/Portugal_(Maria_I)