World War 1

Assassination of Archduke Ferdinand

Jun 28, 1914

{Assassination of Archduke Ferdinand} https://www.history.com/news/the-assassination-of-archduke-franz-ferdinand-100-years-ago

Austria-Hungary declares war on Serbia

Jul 28, 1914

{Austria-Hungary declares war on Serbia} https://www.loc.gov/rr/news/topics/ww1declarations.html