Germany, Austria-Hungary, and Italy (later joined by the Ottoman Empire) formed the Triple Alliance.
Explanation:
Formed in May 1882, the Triple Alliance remained a secret alliance between Germany, Austria-Hungary, and Italy. This alliance renewed periodically until the First World War. Initially, Germany and Austria-Hungary were its firm members but during the course of time, after losing North African enterprises to the French, Italy also sought the support of this alliance. These three countries formed the Triple Alliance in World War I.
