|Convention between the United States, the German Empire, and Great Britain Governments in Respect to Samoa|
German, British, and American warships in Apia harbour, 1899
|Signed||2 December 1899|
|Effective||16 February 1900|
|Citations||31 Stat. 1878; TS 314; 1 Bevans 276|
|Abrogated the Treaty of Friendship and Commerce Between the United States and the Government of the Samoan Islands of 17 February 1878 (20 Stat. 704; TS 312; 1 Bevans 437). Abrogated the Treaty of Berlin of 14 June 1889 (26 Stat. 1497; TS 313; 1 Bevans 116).|
Forerunners to the Tripartite Convention of 1899 were the Washington Conference of 1887, the Treaty of Berlin of 1889, and the Anglo-German Agreement on Samoa of 1899.
By the 1870s modern economic conditions were well established and accepted by the Samoans, who had just enough of a government that could be manipulated at will by the foreign business interests in Samoa. After the United States concluded a friendship treaty with Samoa in 1878, Germany negotiated her own Favorite Nation Treaty in 1879 with the same Samoan faction as the U.S., while later in 1879 the Anglo-Samoan treaty was completed with a rival faction. Contentions among the whites in Samoa, plus native factional strife led to side-choosing that became deadly warring with the introduction of modern weapons.
Washington conference of 1887
To attempt to resolve some of the problems, the United States, Germany, and the United Kingdom agreed to a conference at Washington in June 1887. After the surfacing of serious disagreements among the parties, the conference adjourned without results. Fighting by nationals of the three powers with their factional local allies led to a conflict that was only tempered by the Apia hurricane of 1889 that wrecked warships on the verge of hostilities.
Treaty of Berlin of 1889
The seriousness of the situation was finally recognized and German foreign minister Count Herbert von Bismarck (chancellor Otto von Bismarck's son) proposed to reconvene the adjourned Washington conference of 1887.  He invited U.S. and British representatives to Berlin in April 1889.  Bismarck's pragmatic approach proposed protection for life, property, and commerce of the treaty participants and relegated native government and their unstable "kings" to the Samoans, with which the British concurred. The United States insisted on a three powers authority while preserving native rights. In the Treaty of Berlin of 1889 thus a joint protectorate or condominium was declared, with a European/American chief justice, a municipal council for Apia, and with the "free right of the natives to elect their Chief or King" as the signatory to the act, thus the treaty professed to recognize a Samoan independent government. 
No sooner was the native royal figurehead appointed, and after disturbances restored, the other chiefs went into rebellion and civil war ensued. By the end of the 19th century, the failure of the arrangement was freely admitted by the governments of the three powers since the principal protagonists in Samoa acted directly for their own interests, frequently overruling the officials of the condominium. A dissolution of the condominium created by the "entangling alliance" was now in play.
The German government "had never made a secret of their belief that international control of Samoa was visionary and impractical ... and they began a series of diplomatic moves intended to eliminate it altogether."  German diplomats in Washington had ascertained during the summer of 1899 that the United States administration was satisfied with obtaining the island of Tutuila with its key asset, the existing coaling station at Pago Pago. With "partitioning of Samoa" by then the prevailing understanding, the United States expressed no objections to Britain and Germany "coming to a preliminary agreement." 
Kaiser Wilhelm II had accepted an invitation to visit England in November 1899 and his government insisted that an agreement on Samoa should be concluded before his departure for Britain.  A settlement was reached at London by 9 November and signed on 14 November.  It was therefore this Anglo-German agreement on Samoa in tandem with the informal understanding with the United States that partitioned Samoa. It only remained for the three powers to negotiate a tripartite convention in order to secure the approval of the United States to the whole agreement.  The Tripartite Convention of 1899 was duly constituted and documents were signed at Washington on 2 December 1899 by the U.S. Secretary of State John Hay, Baron Theodor von Holleben, German ambassador to the United States, and Sir Julian Pauncefote, British ambassador to the United States, with ratifications exchanged on 16 February 1900. 
- President William McKinley signed an executive order on 19 February 1900, reading: "The Island of Tutuila, of the Samoan Group, and all other islands of the group east of longitude 171 degrees west of Greenwich, are hereby placed under the control of the Department of the Navy for a naval station. The Secretary of the Navy shall take such steps as are necessary to establish the authority of the United States and to give to the islands the necessary protection." On the same day John D. Long, Secretary of the Navy, stated further that these islands "... are hereby established into a naval station, to be known as the naval station, Tutuila, and to be under the command of a commandant." Rose Island, an uninhabited coral atoll, and the island of Aunu'u were included. The cession of deeds of the islands of the Manua Group ( Ta'u and Ofu-Olosega) did not take place until 1904, although the respective chiefs had previously accepted the sovereignty of the United States.  The term " American Samoa" entered into conscious usage in 1905 with a first assembly or fono of Samoan chiefs from all ceded islands within the naval station.   
- The Samoan islands of Upolu and Savaii and the small islands of Apolima and Manono, west of 171 degrees west longitude, were declared a protectorate of the German Empire and became known as German Samoa, with flag-raising on 1 March 1900 and appointment of Wilhelm Solf as governor. This "happy acquisition" was viewed[ by whom?] in Germany as a "splendid achievement in colonial policy, which is at the same time a genuinely popular one." 
United Kingdom: 
- By surrendering all rights in Samoa, the United Kingdom "obtained extensive compensation from Germany elsewhere",  in effect, "transfer of all of the German rights in the Tonga group including that of establishing a naval and coaling station, and the right of extraterritoriality; the shifting of the line of demarcation between German and British islands in the Solomon group so as to give to Great Britain all the German islands to the east and southeast of the island of Bougainville; the division of the so-called neutral zone in West Africa by a definite boundary line between British and German possessions; the promise of Germany to take into consideration, as much and as far as possible, the wishes which the Government of Great Britain may express with regard to the development of reciprocal tariffs in the territories of Togo and the Gold Coast; the renouncing by Germany of her rights of extraterritoriality in Zanzibar." 
These treaty arrangements of the Tripartite Convention of 1899 stayed in place until the outbreak of World War I in 1914.
- Gray, Amerika Samoa, p. 86
- Ryden, The Foreign Policy of the United States in Relation to Samoa, p. 455; in deference to the American delegation who had few German or French speakers (French was then the language of international diplomacy), Count Bismarck agreed to conduct the proceedings in English
- Gilson, Samoa 1830-1900, p. 396
- Gray, p. 100
- The United Kingdom was then embroiled in the Second Boer War and therefore viewed as in a weakened bargaining position [Coates, Western Pacific Islands, p. 230], however, the German desire to rapidly conclude the negotiations and bring the western Samoan islands into their colonial empire, had a balancing effect that was clearly evidenced in the agreement as signed.
- Gilson, p. 432
- The United States Department of State was informed on 9 November 1899 through the U.S. embassy at Berlin that foreign minister Count Bernhard von Bülow expressed the hope to the U.S. chargé dʻaffaires that the Anglo-German "agreement would meet with the satisfaction of the United States," since according to the agreement, "... not only Tutuila would become the property of the United States, but also the smaller islands" of the Manua group [Ryden, p. 571].
- Ryden, p. 572
- Ryden, p. 574
- Ryden, p. 575-576
- Gray, p. 160
- Beginning with the American-Samoan Friendship treaty of 1878, to the Washington Conference of 1887, to the Berlin Conference in 1889, and finally to the Tripartite Convention of 1899, the United States held a consistent position, if not always publicly, to acquire the coaling station at Pago Pago Bay. It was the probability of building a canal in Central America that defined this American perspective.
- Swains Island, a privately-owned atoll in the Tokelau group, became officially part of American Samoa by annexation on 4 March 1925.
- 'Britain' or 'Great Britain' cited in direct quotes
- Ryden, p. 571
- Coates, Austin. Western Pacific Islands. London: H.M. Stationery Office. 1970.
- Gilson, R. P. Samoa 1830-1900, The Politics of a Multi-Cultural Community. Melbourne: Oxford University Press. 1970.
- Gray, J. A. C. Amerika Samoa, A History of American Samoa and its United States Naval Administration. Annapolis: United States Naval Institute. 1960.
- Ryden, George Herbert. The Foreign Policy of the United States in Relation to Samoa. New York: Octagon Books. 1975. (Reprinted by special arrangement with Yale University Press. Originally published at New Haven: Yale University Press. 1928.)
- Townsend, Mary Evelyn. Origins of Modern German Colonialism, 1871-1885. New York: Vol. IX of Columbia University Studies in History, Economics, and Public Law. 1921.