Question: When did italy enter the first world war?

context: Italy was a formal member of the Triple Alliance, alongside Germany and Austria-Hungary. However it also maintained good relations with France and Russia. The other countries understood this duality, and did not expect Italy to join in the war in 1914. Its treaty obligations did not require it to join with Germany and Austria, and it saw very little to gain from doing so. Public opinion wanted peace, and the leadership in Rome realized how poorly prepared the nation was in contrast to the powerhouses at war. By late 1914, however, Prime Minister Antonio Salandra and Foreign Minister Sidney Sonnino decided that major territorial gains were possible by joining the Allies, and would help calm extremely serious internal dissension, by bringing glory to the victorious army, as well as satisfying popular feeling by freeing Italian-speaking territories from Austrian rule. There were also new patronage opportunities and political victories for the politicians. They planned to argue, plausibly, that these results would be the triumph it climax of "Risorgimento" (that is, Italian unification). In December 1914 Sonnino opened negotiations in Vienna, asking for territorial compensation in return for remaining neutral. These talks were designed to conceal the government's true intentions from the Italian public opinion, and from the countries at war. In March 1915 Sonnino began serious negotiations with London and France. They had an exaggerated opinion of what Italy could contribute, not realizing it would be a very expensive drain on Allied money, manpower and munitions. The Treaty of London was signed on 26 April 1915 and Italy declared war against Austria-Hungary on 23 May 1915. Salandra boasted that the Pact of London was "the greatest, if not the first completely spontaneous act of foreign policy executed by Italy since the Risorgimento."
question: When did italy enter the first world war by signing the Treaty of London?
short_answers: 26 April 1915
context: Italy was a formal member of the Triple Alliance, alongside Germany and Austria-Hungary. However it also maintained good relations with France and Russia. The other countries understood this duality, and did not expect Italy to join in the war in 1914. Its treaty obligations did not require it to join with Germany and Austria, and it saw very little to gain from doing so. Public opinion wanted peace, and the leadership in Rome realized how poorly prepared the nation was in contrast to the powerhouses at war. By late 1914, however, Prime Minister Antonio Salandra and Foreign Minister Sidney Sonnino decided that major territorial gains were possible by joining the Allies, and would help calm extremely serious internal dissension, by bringing glory to the victorious army, as well as satisfying popular feeling by freeing Italian-speaking territories from Austrian rule. There were also new patronage opportunities and political victories for the politicians. They planned to argue, plausibly, that these results would be the triumph it climax of "Risorgimento" (that is, Italian unification). In December 1914 Sonnino opened negotiations in Vienna, asking for territorial compensation in return for remaining neutral. These talks were designed to conceal the government's true intentions from the Italian public opinion, and from the countries at war. In March 1915 Sonnino began serious negotiations with London and France. They had an exaggerated opinion of what Italy could contribute, not realizing it would be a very expensive drain on Allied money, manpower and munitions. The Treaty of London was signed on 26 April 1915 and Italy declared war against Austria-Hungary on 23 May 1915. Salandra boasted that the Pact of London was "the greatest, if not the first completely spontaneous act of foreign policy executed by Italy since the Risorgimento."
question: When did italy enter the first world war by declaring war against Austria-Hungary?
short_answers: 23 May 1915
context: Italy was a formal member of the Triple Alliance, alongside Germany and Austria-Hungary. However it also maintained good relations with France and Russia. The other countries understood this duality, and did not expect Italy to join in the war in 1914. Its treaty obligations did not require it to join with Germany and Austria, and it saw very little to gain from doing so. Public opinion wanted peace, and the leadership in Rome realized how poorly prepared the nation was in contrast to the powerhouses at war. By late 1914, however, Prime Minister Antonio Salandra and Foreign Minister Sidney Sonnino decided that major territorial gains were possible by joining the Allies, and would help calm extremely serious internal dissension, by bringing glory to the victorious army, as well as satisfying popular feeling by freeing Italian-speaking territories from Austrian rule. There were also new patronage opportunities and political victories for the politicians. They planned to argue, plausibly, that these results would be the triumph it climax of "Risorgimento" (that is, Italian unification). In December 1914 Sonnino opened negotiations in Vienna, asking for territorial compensation in return for remaining neutral. These talks were designed to conceal the government's true intentions from the Italian public opinion, and from the countries at war. In March 1915 Sonnino began serious negotiations with London and France. They had an exaggerated opinion of what Italy could contribute, not realizing it would be a very expensive drain on Allied money, manpower and munitions. The Treaty of London was signed on 26 April 1915 and Italy declared war against Austria-Hungary on 23 May 1915. Salandra boasted that the Pact of London was "the greatest, if not the first completely spontaneous act of foreign policy executed by Italy since the Risorgimento."
question: When did italy enter the first world war by signing the Treaty of London?
short_answers: 26 April 1915
context: Italy was a formal member of the Triple Alliance, alongside Germany and Austria-Hungary. However it also maintained good relations with France and Russia. The other countries understood this duality, and did not expect Italy to join in the war in 1914. Its treaty obligations did not require it to join with Germany and Austria, and it saw very little to gain from doing so. Public opinion wanted peace, and the leadership in Rome realized how poorly prepared the nation was in contrast to the powerhouses at war. By late 1914, however, Prime Minister Antonio Salandra and Foreign Minister Sidney Sonnino decided that major territorial gains were possible by joining the Allies, and would help calm extremely serious internal dissension, by bringing glory to the victorious army, as well as satisfying popular feeling by freeing Italian-speaking territories from Austrian rule. There were also new patronage opportunities and political victories for the politicians. They planned to argue, plausibly, that these results would be the triumph it climax of "Risorgimento" (that is, Italian unification). In December 1914 Sonnino opened negotiations in Vienna, asking for territorial compensation in return for remaining neutral. These talks were designed to conceal the government's true intentions from the Italian public opinion, and from the countries at war. In March 1915 Sonnino began serious negotiations with London and France. They had an exaggerated opinion of what Italy could contribute, not realizing it would be a very expensive drain on Allied money, manpower and munitions. The Treaty of London was signed on 26 April 1915 and Italy declared war against Austria-Hungary on 23 May 1915. Salandra boasted that the Pact of London was "the greatest, if not the first completely spontaneous act of foreign policy executed by Italy since the Risorgimento."
question: When did italy enter the first world war by declaring war on Austria-Hungary?
short_answers: 23 May
23 May 1915

Answer: Italy entered the First World War in 1915 by signing the Treaty of London on 26 April 1915 and by declaring war on Austria-Hungary on 23 May 1915. The Treaty of London was a secret agreement between the United Kingdom, France, Russia, and the Kingdom of Italy with the aim of enticing Italy to enter the First World War on the side of the Triple Entente.