Though the assassination of the archduke was the flash point that led to war, some have suggested that, given the underlying tensions that had built up in Europe over decades, war was, to some extent, inevitable.
It's almost hard to believe 100 years later, but many leaders at the time thought World War I would be over quickly. Few, if any, would have predicted a four-year battle of attrition that would result in millions of lost lives.
Since 1945, the major powers in the world have not gone to war with one another — even at the peak of the Cold War.
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