It all started with two people being killed in Sarajevo. Four years later, four European empires were gone.
The Russian Empire was taken over as the first Communist state.
The Ottoman Empire had been the “Sick Man of Europe” for generations. It was no more.
The German Empire was defeated, and its chaos sowed the seeds for Round Two, which was nastier.
The Habsburg Empire, cobbled together many different places, which became independent nations.
The two surviving empires Britain and France were bloodied. World War II, helped to finish them off.
Empires seem to go down the tube. Lots of management issues.