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Kalahira
The answer to this question is that the country who vied Spain for control of the Mississippi River is Spain. On the 9th of April 1682 La Salle announced that he was to claim the entire Mississippi River basin for France. He even renamed it La Louisiane after Louis XIV.
the country who vied Spain for the control of the Mississippi River is France. I just took a quiz on this and this answer is correct. Hope this helps. :)