Answered


A major reason President Thomas Jefferson
authorized the Lewis and Clark expedition was to
(1) claim California for the United States
(2) explore a route to the Pacific Ocean
(3) remove British outposts from United States
land
(4) establish settlements in the Southwest



Answer :

A major reason President Thomas Jefferson authorized the Lewis and Clark expedition was to "(4) establish settlements in the Southwest"--he wanted to see what the land had to offer.