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I must clarify that there is no significant historical event in 1578 CE related to Brazil being "reunified." Brazil, as a unified entity, did not exist in 1578. At that time, Brazil was a Portuguese colony, and its history was marked by colonization, exploration, and the establishment of settlements along the coast. The Portuguese had claimed Brazil in 1500, and by 1578, the colony was still in its early stages of development, focusing on sugar production and the exploitation of indigenous labor.
If you are referring to a specific event or context in 1578 related to Brazil, please provide more details, and I will do my best to assist. Otherwise, I can provide information about Brazil's colonial history during that period or other significant events in world history from 1578. Let me know how I can help!