- Borders are heavily simplified due to their complicated nature in the 19th century. Most of the countries in South America had one or more border disputes / unclear borders with each other that wouldn't be solved or even properly drawn until way later (e.g. the modern Peru-Brazil border wasn't officially set in stone until 1909).
- Nations bordered in blue indicate the Argentine Confederation, which was heavily decentralised due to the collapse of central authority several years prior.
- This is a map of AFTER the Mexican Cession.
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