A key reason that American frontiersmen had been so much for the war in the first place was the threat posed to their continued settlement of territory that was inhabited by Native Americans of various tribes. The frontiersmen blamed Native Americans' attacks on the arms and supplies that were provided by British agents in Canada. In addition, the frontiersmen wanted access to lands for which the British acknowledged belonged to the United States but blocked its expansion by inciting and arming the Native Americans. The 1813 death of Tecumseh in battle removed a powerful obstacle to American expansion although the Native Americans' involvement in the war continued, as did their resistance to American westward expansion after it ended. The Native Americans were the main losers in the war by their loss of British protection and never regained their influence.