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Soyo is a city, with a population of 200,920, and a municipality, with a population of 227,175, located in the province of Zaire in Angola, at the mouth of the Congo River. Historically, Soyo was a significant city in conflicts between the Kingdom of Kongo, Portuguese Angola, and the Dutch West India Company. Soyo became an independent state in the 17th century and had significant influence on politics in Kongo during the Kongo Civil War.