Perhaps the greatest way in which these two time periods were similar is in terms of intolerant attitudes. Both we periods of great discrimination against minorities and women. The 1950s saw far more of a literary revival than the 20s.
No military action led to the start of WW1; the catalyst to WW1 was the assassination of Franz Ferdinand, the archduke of Austria-Hungary. His murder by Gavrilo Princip – a Serbian nationalist, caused Austria-Hungary to declare war on Serbia, which drew the other European countries into the war due to their existing treaties of mutual defense.