I think that shifting the Americas 1 tile to the right might help the issue, but it also looks like it'll need tweaking regardless, which I'm happy to help with!
Relatedly, I've finished reviewing the South American and Caribbean (and a bit of Central America) names, and attached here the xml for both the locations and the new localization. Let me know if it looks correct - I tried to reuse existing LOC names where possible, but I may have missed a few so you may have some duplicate LOC codes potentially.
With the new names, I've got some suggestions on some geographical tweaks for the map if/when you want to include them:
A quick summary:
- Shortening/moving the Magdalena River
- Moving split in the Tocantins River
- Adjusting splits of the Paraná, Paraguay, and Uruguay Rivers
- Adjusted region boundaries to better match provincial/national borders - new borders marked in solid yellow lines (Ecuador was split before, so I've moved fully to Colombia)
Two parts that may require more thought: La Plata loses a good chunk of land - the tile marked with a question mark is associated with the city of Araguaiana (a Brazilian city), which is the largest city in that area, but we could swap it for Artigas (Uruguay), Curuzú Cuatiá, or Mercedes (Argentina), to push the border back a bit. Similarly, Venezuela loses a bit of land to Colombia along the Meta River, which makes it's southern portion a bit spindly - I could probably find a Venezuelan city to swap out in the easternmost swapped tile though if the shape was undesirable.
Lastly, if you're up for terrain changes: 162, 43 could get another island for the Caribbean, I've chosen to have it represent Port of Spain, Trinidad and Tobago. 159, 26 is currently a mountain, but could be flattened for Trinidad, Bolivia. (Trinidad-themed changes, I guess!)