Supreme Court Cases
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By 1800, the many millions of Native Americans had been reduced to 600,000 Native Americans in the area now comprising the continental United States. By 1890, their population had declined to about 250,000.  The United States continued to gain title to Native American land after the Treaty of Greenville, at a rate that created alarm in Indian communities. [ citation needed ] In 1800, William Henry Harrison became governor of the Indiana Territory and, under the direction of President Thomas Jefferson , pursued an aggressive policy of obtaining titles to Indian lands. Two Shawnee brothers, Tecumseh and Tenskwatawa , organized Tecumseh's War , another pan-tribal resistance to American expansion.