Why did Italy leave the Triple Alliance and enter the First World War in 1915 on the side of the Entente?

Answer and explanation

Correct answer: B. The Treaty of London promised territories such as Trentino and Trieste

  1. Step 1: The Triple Alliance was defensive, and Italy argued that Austria's attack on Serbia did not oblige it to join. Step 2. In April 1915 the secret Treaty of London promised Italy territories at the end of the war, and the government declared war on Austria-Hungary in May. Answer: the Treaty of London promised territories Austria would not give. Why not the others: Germany never invaded Italy in 1915, France made no such papal promise and Russia was an ally of the Entente.

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