France signed a secret treaty with Spain (immediately after settling its difficulties with the U.S. through the Convention of 1800) which returned Louisiana to France.

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The secret Treaty of San Ildefonso, signed in 1800 between France and Spain, resulted in the return of the Louisiana territory to France from Spain, after France settled its disputes with the U.S. through the Convention of 1800 (also known as the Treaty of Mortefontaine).

France Signed a Secret Treaty with Spain (Immediately After Settling