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1492
Germany created the Triple Alliance to prevent a two front war.
in 1890
The Triple Alliance was an alliance to counter the Triple Entente, an other Alliance, it contained Germany, Austria-Hungary, the Ottoman Empire and Italy. Italy left the Triple Alliance on April 26th 1915 to join the Triple Entente in world war one
Germany joined Austria-Hungary and Italy to create the triple alliance.
france
The Triple Alliance between Germany, Austria-Hungry and Italy was a secret alliance formed in May 1882. While no one joined the alliance in 1915, Italy did leave the alliance and join the allies.
Germany
At the outbreak of WWI, it was the triple alliance with Germany, Austria-Hungary and Italy against the triple Entente, with France, UK commonwealth and Russia. Later Italy dropped out to join the Entente and Bulgaria and the Ottomans joined, and this alliance came to be called the central powers. The Entente kept its name although it wasn't triple anymore when Japan, Romania, Serbia and others joined.
Bulgaria joined NATO's Partnership for Peace in 1994 and applied for NATO membership in 1997. During the November 2002 Prague Summit Bulgaria was one of seven former socialist countries invited to join the Alliance. Bulgaria became a member of NATO in March 2004.
Possibly. The exact date is not known yet, but Bulgaria's agreement was that the country could join the Schengen Area no earlier than 2013.
Germany, Austria-Hungary and Italy. (Italy later switched sides to join the Triple Entente: Great Britain, Russia and France; the Ottoman Empire and Bulgaria later joined the Triple Alliance).