Why is Brazil's western border not a vertical line at 370 leagues west of the Cape Verde islands per the Treaty of Tordesillas?

by JarJarAwakens

What changed that allowed Brazil to grow westward?

TywinDeVillena

I think this old answer of mine will fit your question

https://www.reddit.com/r/AskHistorians/comments/epysm0/how_was_established_the_spanishportuguese_earth/