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Brazil gained it independence on September 7th, 1822. Brazil got their independence because an antagonistic relationship happened between Brazil and Portugal. Brazil proved that their people could over power them.
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One day, in 1808, France invaded Portugal and the Royal Family had to flee to Brazil. In 1815, Brazil ceased to be just a colony, despite still being under the domination of Portugal, when Dom João VI created the United Kingdom of Portugal, Brazil and Algarves. Those were some steps towards independence.