Starting in 1803, Jefferson promoted a western expansionist policy, organizing the Louisiana Purchase, doubling the nation's land area. To make room for white settlement, Jefferson began a controversial process of Indian tribal removal from the newly acquired territory. To make room for white settlement, Jefferson began a controversial process of Indian tribal removal from the newly acquired territory. As a result of peace negotiations with France, his administration reduced military forces. After retiring from public office, Jefferson founded the University of Virginia. In keeping with his Enlightenment thinking, President Jefferson adopted an assimilation policy towards American Indians known as his 'civilization program' which included securing peaceful U.S. – Indian treaty alliances and encouraging agriculture. Jefferson advocated that Indian tribes should make federal purchases by credit holding their lands as collateral for repayment.