First Treaty Of San Ildefonso
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| Signed | 1 October 1777 |
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| ID | 1400199 |
About First Treaty Of San Ildefonso
The First Treaty of San Ildefonso was signed on 1 October 1777 between the Spanish Empire and the Portuguese Empire. It settled long-running territorial disputes between the two countries in South America, primarily in the Río de la Plata region.