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.
The Louisiana Purchase nearly doubled the size of the United States when Thomas Jefferson bought the territory from France in 1803. All or part of 15 states are included in th â¦ e territory and it allowed for Americans to discover new space and resources in the west.