On June 28, 1914, in an act that sparked World War I, Archduke Franz Ferdinand of Austria and his wife, Sophie, were shot to death in Sarajevo by Serb nationalist Gavrilo Princip.

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Today's Highlight in History: On June 28, 1914, Archduke Franz Ferdinand of Austria and his wife, Sophie, were shot to death in Sarajevo by Serb nationalist Gavrilo Princip, an act that sparked World War I.

In 1921, an unknown World War I American soldier was buried in Arlington National Cemetery. This site, on a hillside overlooking the Potomac R…