Which country initially sided with the Central Powers but ended up joining the Allies in 1915 in hopes of postwar gain?

Question

Quizplus · Accepted Answer

Italy initially sided with the Central Powers due to its membership in the Triple Alliance with Germany and Austria-Hungary. However, Italy switched sides and joined the Allies in 1915 after being promised territorial gains at the expense of Austria-Hungary in the Treaty of London.

Which Country Initially Sided with the Central Powers but Ended