From Wikipedia (https://en.wikipedia.org/wiki/Independence_Day_(Brazil) )
(7 September) The Independence Day of Brazil (Portuguese: Dia da Independência), commonly called Sete de Setembro (Seventh of September), is a national holiday observed in Brazil on September 7 of every year. The date celebrates Brazil’s Declaration of Independence from the United Kingdom of Portugal, Brazil and the Algarves in 1822.
In 1808, French troops commanded by Emperor Napoleon Bonaparte invaded Portugal as a retaliation for the Iberian country’s refusal to participate in the trade embargo against the United Kingdom. Fleeing persecution, the Portuguese monarchs transferred the Portuguese Court from Lisbon to Rio de Janeiro, then capital of Colonial Brazil. In 1815, Prince Regent John VI created the United Kingdom of Portugal, Brazil and the Algarves, elevating Brazil to the rank of kingdom and increasing its administrative independence. Brazil, Portugal, and Great Britain were the three major contributors to the Independence of Brazil all three motivated by the circumstances peculiar to each. Brazil’s Independence was ultimately won through diplomacy after 3 years of war against Portugal.
A political revolution erupted in Portugal in 1820, forcing the royal family to return. John VI’s heir, Pedro, Prince of Brazil, remained in Brazil. In 1821, the Portuguese Assembly demanded Brazil return to its former condition of colony and the crown prince to return to Portugal. Pedro, influenced by the Rio de Janeiro Senate (Senado da Câmara) refused to return on January 9, 1822, a date which became known as Dia do Fico (I’ll Stay Day).
On September 2, 1822, a new decree with Lisbon’s demands arrived in Rio de Janeiro, while Prince Pedro was in São Paulo. Princess Maria Leopoldina, acting as Princess Regent, met with the Council of Ministers and decided to send her husband a letter advising him to proclaim Brazil’s independence. The letter reached Prince Pedro on September 7, 1822. That same day, in a famous scene at the shore of the Ipiranga River, he declared the country’s independence, ending 322 years of colonial dominance of Portugal over Brazil.
Brazilian Hellenes will want to celebrate their nation’s foundation.