Emperor William II had accepted an invitation to visit England in November 1899 and his government insisted that an agreement on Samoa be reached before leaving for Britain.  On 9 November, an agreement was reached in London, signed on 14 November.  It was therefore this Anglo-German agreement on Samoa, in conjunction with the informal agreement with the United States, that divided Samoa. All that remained was for the three powers to negotiate a tripartite agreement to obtain the agreement of the United States on the entire agreement.  The 1899 tripartite agreement was duly constituted and documents were signed on 2 December 1899 in Washington by US 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 the exchange of ratifications on 16 February 1900.  The tripartite pact, also known from the Berlin Pact, was an agreement between Germany, Italy and Japan, signed on 27 September 1940 in Berlin by Joachim von Ribbentrop, Galeazzo Ciano and Sabura Kurusu. It was a military defence alliance, followed by Hungary (20 November 1940), Romania (23 November 1940), Bulgaria (1 March 1941) and Yugoslavia (25 March 1941) and the German clientelistic state of Slovakia (24 November 1940). Two days later, Yugoslavia`s accession provoked a coup d`état in Belgrade. Germany, Italy and Hungary responded by invading Yugoslavia. The resulting Italian-German clientelistic state, known as the independent state of Croatia, joined the Covenant on 15 June 1941.
Tripartite Pact, an agreement reached by Germany, Italy and Japan on September 27, 1940, one year after the start of World War II. It has created a defence alliance between countries and should, to a large extent, prevent the United States from entering the conflict. Hungary, Romania, Slovakia, Bulgaria, Yugoslavia and Croatia have signed the pact. The tripartite pact was the culmination of a series of agreements between Germany, Japan and Italy. On 25 October 1936, Germany and Italy concluded the Rome-Berlin axis, a cooperation agreement. A month later, Japan joined the so-called axis powers by signing (with Germany) the anti-communist pact, an anti-communist agreement that targeted the Soviet Union in the first place; Italy signed in 1937. However, this pact was broken with the German-Soviet non-aggression pact of 23 August 1939, which paved the way for Germany to invade Poland the following week and thus begin the Second World War. Economic relations between the tripartite powers have been marred by difficulties. Japan would not make economic concessions to Germany in 1941, fearing that they would ruin its negotiations with the United States. Negotiations on economic cooperation began in January 1942, but an agreement was not signed until 20 January 1943 in Berlin.
Italy was invited to sign a similar agreement simultaneously in Rome for propaganda purposes, but none of Berlin`s complementary protocols applied to Italian-Japanese relations.  Japan pressed Germany on 2 December 1941, just two days after informing Berlin of its intention to go to war, to join the war with the United States. Japan did not receive a response and turned to Italy. On the morning of December 5, at 4 a.m., Ribbentrop presented the Japanese ambassador with a proposal approved by Italy to join the war and follow it together.