Explain how the Louisiana Purchase fit into Thomas Jefferson's plan for Native Americans.

Thomas Jefferson's only real plan for Native Americans was
to try push them out of the lands that white settlers wanted, particularly if the
Indians would not assimilate into white culture.  While the Louisiana Purchase was not
made with this goal in mind, it did give the United States a place to put the Indians if
they needed to be pushed out of territories they
occupied.

Jefferson had in mind to push Native Americans
off to the west of the Mississippi River.  This can be seen in the google.com link
below.  With the Louisiana Purchase, the US obtained a great deal of land west of the
Mississippi.  This meant that the US could now (as Jefferson planned) have a place to
which to move Native Americans who were in the way of white
progress.