How did Spain benefit from the 1494 Treaty of Tordesillas? The treaty gave Spain exclusive access to the Americas.
The treaty split the Americas equally between Spain and Portugal.
The treaty let Portugal settle most of the Americas.
The treaty kept Portugal out of most of the Americas.

The answer is the first one

Explanation:

The treaty was signed by Spain and Portugal in 1494 to settle their rival claims of the islands that Columbus discovered. ... Spain benefited because they claimed most of the Americas which would be crucial later in colonial development.

because mexico wanted to choose a centralized location

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