How could one act of terror cause a world war?

'How could one act of terror cause a world war? Explain the causes behind World War I and what might have been done to prevent it 1914, World War One began, the most horrific war the human race had ever seen, lasting for 4 years and precisely three months. Estimates of just over 30 million people were killed. Those who lived through this war referred to it as the 'Great War', we as a country lost just fewer …

…has taught the world to live in a different way, but as it's said "one who doesn't learn from their actions will repeat them", if we as a race of beings, cannot learn that war destructs all and cannot bring peace, then it's only a matter or time before we see the greatest war to be fought on the face of this earth, a war in which could wipe out humankind eternally, World War Three.