Legal Definition of vested. 1  1 : fully and absolutely established as a right, benefit, or privilege : not dependent on any contingency or condition; specifically : not subject to forfeiture if employment terminates before retirement vested pension benefits. 2  2 : having a vested interest a vested employee a vested beneficiary.
Thomas Jefferson was the President when the Louisiana Purchase  transaction was negotiated. The people who actually signed the  Purchase Treaty were James Monroe, Robert Liv â¦ ingston, and Barbe  Marbois.
Thomas Jefferson wanted to buy the settlement of New Orleans from the French. It was a major seaport that was fed from the Mississippi River, making it important to many American businesses. He sent Robert Livingston, the U.S. Minister to France, to try and buy the land from the French Emperor Napoleon.