The control of New Orleans was important to Jefferson because the settlers along Mississippi River Valley would lose free access to the port of New Orleans.
The quoted was Thomas Jefferson response "There is on the globe one single spot, the possessor of which is our natural and habitual enemy. It is New Orleans." because he feared some circumstances
He feared that the Louisiana, New Orleans will come under the French control thereby, losing the Louisiana port.
In conclusion, the control of New Orleans was important to Jefferson because the settlers along Mississippi River Valley would lose free access to the port of New Orleans.
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