The United States also sent delegates to the international conference held at Brussels in 1890 for the purpose of dealing with the slave trade in certain unappropriated regions of Central Africa. The American delegates insisted that prohibitive duties should be imposed on the importation of spirituous liquors into the Kongo. The European representatives, being unwilling to incorporate the American proposals, framed a separate tariff convention for the Kongo, which the American delegates refused to sign. The latter did, however, affix their signatures to the general treaty which provided for the suppression of the African slave trade and the restriction of the sale of firearms, ammunition, and spirituous liquors in certain parts of the African continent. In ratifying the treaty the Senate reaffirmed the American policy of isolation in the following resolution: "That the United States of America, having neither possessions nor protectorates in Africa, hereby disclaims any intention, in ratifying this treaty, to indicate any interest whatsoever in the possessions or protectorates established or claimed on that Continent by the other powers, or any approval of the wisdom, expediency or lawfulness thereof, and does not join in any expressions in the said General Act which might be construed as such a declaration or acknowledgement; and, for this reason, that it is desirable that a copy of this resolution be inserted in the protocol to be drawn up at the time of the exchange of the ratifications of this treaty on the part of the United States."