So if the Portuguese Brazilians wanted to gain more regional, and global power, couldn't they just get rid of a lot of Amazon rainforest for agriculture, regional power, and to maybe stretch out the population. And this is interesting because you mentioned a British-Portuguese/Brazilian war over the Atlantic slave trade. So we could have this new Portuguese empire in Brazil cutting down a lot of the rainforest to make room for agriculture, then be putting their slave trade in overdrive to make as much money off the fertile grassland as possible. Then Britan wanting to stop the last remnant of the Atlantic slave trade gives an ultimatum to stop the import of slaves, or it's war. The Portuguese emperor declines, seeing how this opportunity could make Brazil the most powerful nation in South America, and even both American Continents, and making the Americas, and southern hemisphere centred around Brazil, and maybe even influencing European politics with its might. Then Britan declares war.
Now If this war was to happen on a timeline were During the Napoleonic wars the Portuguese royal family flees and stays in Brazil, and Portugal and the rest of the Portuguese empire's colonies become colonies of a relocated Portuguese empire, and we have the Emperor cutting down parts of the Amazon rainforest for agricultural purposes, then kicking slave exports into hyperdrive, causing war with Britan, could we see this type of war escalates, and inflame South, and Latin America. Could we see this war becoming 'South Americas World war" And maybe even spilling over into Europe?
Could you find a date to which this war between the Relocated Portuguese empire and British empire could happen? Would it involve other South, and Latin American powers, and could European ones get involved, or even America?
Damn this is a good scenario.