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So, suppose that Brazil, in one of its wars with Argentina in the 19th century, gets lucky and acquires the regions of Paraguay, Misiones, Corrientes, Entre-Ríos, and Uruguay, forming a border all the way down from the Paraguay to the Paraná rivers.
Here's a map for reference:


So, what does this mean for the region? Which places will be the most densely settled, and which will be the most economically productive? How does this affect urban growth patterns in the region?
How does this affect relations with Argentina, and Buenos Aires?
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