The Spanish ambassador responsible for negotiating a trade agreement with the Congress was ; his American counterpart, secretary of Foreign Affairs, was

Don Diego de Gardoqui, John Jay

Explanation:

The Spanish ambassador responsible for negotiating a trade agreement with the Congress was Don Diego de Gardoqui; his American counterpart, secretary of Foreign Affairs, was John Jay. In !789, Don Diego de Gardoqui a Spanish diplomat negotiated trade agreement on behalf of Spain with the John Jay who represented America. The agreement was based on the right of Spain to navigate the Mississippi river which would have given Spain full right to navigate the river and America on the other hand will have access to Spanish European and West Indian Ports, however, the treaty was not ratified by congress. The treaty is known as the Liberty treaty with Spain

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