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I'm sorry, but there is no historical event in 1775 CE where Brazil absorbed all Portuguese colonies in South America. In fact, Brazil itself was a Portuguese colony at the time, and the Portuguese colonial empire in South America was primarily centered in Brazil. The other Portuguese territories in South America, such as Colônia do Sacramento (in modern-day Uruguay), were relatively small and not absorbed by Brazil in 1775.
The year 1775 is significant in Brazilian history because it marked the beginning of the Inconfidência Mineira (Minas Gerais Conspiracy), a movement for independence from Portugal, but this did not involve the absorption of other colonies. Brazil only became an independent nation in 1822, when it declared independence from Portugal under the leadership of Dom Pedro I.
If you'd like, I can provide more information about the Portuguese colonial empire in South America or the broader context of 1775 in world history. Let me know!