In keeping with his Enlightenment thinking, President Jefferson adopted an assimilation policy toward 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. Various tribes accepted Jefferson's policies, including the Shawnees led by Black Hoof, the Creek, and the Cherokees. However, some Shawnees broke off from Black Hoof, led by Tecumseh, and opposed Jefferson's assimilation policies.