A lawfully elected (within the provisions of Article I, Section 3 [Clause 1]) Senate unanimously ratifies the Barlow-Mahomet Treaty agreeing to the payment of tribute to the Bey of Tripoli in exchange for free American commerce in the Mediterranean Sea.  Article XI of the treaty acknowledges,

       [T]he 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, of Mussulmen [Moslems]; and, as the said States never entered into any war, or act of hostility against any Mahometan [Islamic] 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.

       NOTE: The implications of this entry is a source of contention between the editors.  Article XI, and its unanimous ratification, are cited by atheists as evidence that the united States was not founded upon Christianity.  An alternative explanation can be offered that it was an appeasement to the Barbary Pirates as the treaty was based upon nothing more than extortion.

       [added 10/31/2021] Thanks to Jim Lorenz and Bill Holmes for this entry.