PARIS, France (AP) — Unleashed by an archduke’s assassination, World War I gradually entangled more and more countries, killing millions of soldiers and civilians and touching multiple continents.As the world marks 100 years since the fighting stopped, here is a look at some key moments in WWI:1914June 28: Serb teenager Gavrilo Princip kills Austrian Archduke Franz Ferdinand.
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From first shot to silence of peace: World War I timeline
