Neutrality and autonomous government of Samoan Islands. : General act by and between the United States of America, the empire of Germany, and the United Kingdom of Great Britain and Ireland, providing for the neutrality and autonomous government of the Samoan Islands. Concluded at Berlin June 14, 1889. Ratification advised by the Senate February 4, 1890. Ratified by the president February 21, 1890. Ratifications exchanged at Berlin April 12, 1890. Assented to by Samoa April 19, 1890. Proclaimed May 21, 1890.