Kiram–Bates Treaty signed between Sultan of Sulu and United States

Background. The treaty emerged during the Philippine–American War, with the United States seeking to concentrate forces in northern Luzon. Negotiations were conducted by Brigadier General John C. Bates, who went to the Philippines in 1899. The U.S. hoped the Sultan would suppress Moro resistance and ensure Sulu neutrality, while the Sultan's advisers sought economic support and feared American aggression.

Negotiation. Bates was appointed as an agent to negotiate a written agreement with the Sultan. A key point involved the legal status of the Sulu Archipelago. Bates discovered that Spain had held only suzerainty, not sovereignty, over the Sultanate, which disproved a claimed basis for including Sulu in the cession of the Philippines to the United States.

Terms. The treaty recognized the autonomy of local governments in the Sulu Archipelago in return for the Sultan's assistance in suppressing attacks on U.S. forces. However, discrepancies existed between the Tausug and English versions. The English version declared U.S. sovereignty, while the Tausug version referred to support and protection, omitting the word 'sovereignty'.