Some of these old names are kind of funny in my opinion. For example, Mali was called French Sudan despite not being anywhere near Sudan, Bolivia was called Upper Peru despite being southeast of it, etc. By the way, are you sure Indonesia was called Dutch WEST Indies? To the best of my understanding, it was Dutch EAST Indies, wasn't it? I might be wrong, but really amazing quiz! Loved it!
Up is often used for river births instead of North. But in this case, it was because these were lands transferred (administratively) from the Viceroyalty of Peru to the Viceroyalty of Rio de la Plata (southern Spanish empire), and were closer to the Andes than most of Rio de la Plata