Treaty of Tripoli, ratified by the U.S. Senate in 1797. Article 11 states: "As the Government of the United States of America is not, in any sense, founded on the Christian religion; as it has in itself no character of enmity against the laws, religion, or tranquility [sic], of Mussulmen [Muslims]; and, as the said States never have entered into any war, or act of hostility against any Mahometan nation, it is declared by the parties, that no pretext arising from religious opinions, shall ever produce an interruption of the harmony existing between the two countries."