In the 1879, the Dual alliance (Germany and Austria) was made and then Italy joined in 1882 which made the Triple alliance.
Three nations belonged to the triple alliance and they were Germany, Austria-Hungary and Italy.
Members of the Triple Entente were England, France, and Russia. Members of the Triple Alliance were Germany, Austria-Hungary, and Italy.
Italy was in the Triple Alliance, but joined World War I on the side of the Entente because the Alliance was a defense treaty and Italy felt Germany's invasion of Belgium did not meet the requirements for their actions and it anything, it broke the treaty completely.
Germany, Austria-Hungary, and Italy were in the Triple Alliance.
The Triple Alliance, formed in 1882, consisted of Germany, Austria-Hungary, and Italy. Countries that were not part of this alliance included France, Russia, and the United Kingdom, which were aligned in the opposing Triple Entente. Other nations, such as Japan and the United States, also did not belong to the Triple Alliance.
Germany, Austria-Hungary, and later Italy
Triple Alliance, secret agreement between Germany, Austria-Hungary, and Italy formed in May 1882 and renewed periodically until World War I.
Italy refused to honor its alliance with Germany and Austria-Hungary in the triple alliance and joined the allied forces, being promised part of the territory in Austria after the war.
Among the countries that formed the Triple Alliance during World War I—Germany, Austria-Hungary, and Italy—Italy was initially part of the alliance but later switched sides to join the Allies in 1915. Thus, if you are asking which country was not part of the original Triple Alliance, it could refer to any nation outside of these three, such as France, Russia, or the United Kingdom, which were part of the opposing Allied Powers.
The Triple Alliance(Germany, Austria-Hungary, and Italy) and the Triple Entente(France, Britain, and Russia)
Which of these countries was part of the Allies also known as the Triple Entente