Final answer:
Initially, Italy declared neutrality at the outbreak of World War I, but eventually entered on the side of the Allied Powers in 1915 after signing a secret agreement, targeting territorial gains from Austria-Hungary.
Step-by-step explanation:
In response to Italy telling Austria to leave him out of the situation during the period leading up to World War I, Italy declares neutrality for the time being. This is reflective of Italy's initial stance at the outbreak of World War I. Despite Italy's alliance with Germany and Austria-Hungary within the Triple Alliance, Italy proclaimed neutrality in 1914 after the war began.
However, nationalistic sentiments and territorial aspirations led Italy to enter the war on the side of the Allied Powers in 1915 after signing a secret agreement with them. Italy was driven by the prospect of gaining territories from Austria-Hungary. This strategic move was represented by Italy's declaration of war against the Central Powers, which included Austria-Hungary, thus altering Italy's position from a neutral state to an active belligerent in the Great War.