Why were all countries joining the first world war?

The assassination of Archduke Franz Ferdinand was the trigger that set off the Great War. Franz Ferdinand was the heir to the throne of Austria-Hungary. He was assassinated on 28 June 1914 by terrorists from one of Austria-Hungary's rival powers, Serbia.

the images of war are haunting

frederick the great and the war of austrian succession. frederick william of brandenburg-prussia trained his son, frederick, to be a hardy soldier. he also declared himself king of bohemia, and maria theresa sent troops to retake bohemia. in august he led 80,000 of these men across the frontier into bohemia, his