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I was always curious about what it would be like if Portugal and Brazil remained united in the same empire.

It is possible that instead of declaring Brazil's independence, Pedro IV (Pedro I of Brazil) starts a Portuguese civil war claiming that the liberal government in Lisbon is illegitimate and the decisions of the Cortes could lead to the secession of Portuguese America. In order to prevent the loss of Brazil, Pedro IV declares himself king of the United Kingdom of Portugal-Brazil and starts the conflict.

Is it possible that Peter IV can win such a conflict?
Would he get support from both Brazilians and Portuguese unhappy with the liberal government?
Would the Portuguese accept Brazilians as equals after the end of the conflict?
Could the capital stay in Rio de Janeiro, or in any city in the new world?
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