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First world war
World War I was caused by militarism, imperialism, nationalism, and a system of alliances that drew the major European powers into war. The immediate trigger was the assassination of Archduke Franz Ferdinand of Austria-Hungary by a Serbian nationalist. This led Austria-Hungary to declare war on Serbia and their ally Germany to back Austria, drawing in their enemies Russia, France and eventually Britain on the opposing side. The war became a bloody stalemate as new industrial weapons and trench warfare led to massive casualties with little movement in the front lines for years. When it ended in 1918 over 8 million soldiers had been killed making it one of the deadliest conflicts in history.
![Hogan's History- World War I [Updated 18 Apr 2015]](https://cdn.slidesharecdn.com/ss_thumbnails/7-150311103517-conversion-gate01-thumbnail.jpg?width=640&height=640&fit=bounds)
