World War I: A look back 100 years later

Published: Jul 28 2014 11:46:33 AM EDT

Today marks the 100th anniversary of the beginning of World War I. Take a look back at one of the bloodiest conflicts in human history.

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Today marks the 100th anniversary of the beginning of World War I, when Austria-Hungary invaded Serbia following the assassination of Archduke Franz Ferdinand. The battle would last a bloody four years and cost more than 37 million civilian and military lives in one of the deadliest conflicts in human history.

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    U.S. National Oceanic and Atmospheric Administration

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