What consequences did the First World War have for the warring countries?

A military conflict among European countries has been brewing since the end of the 19th century. The reason was the murder by the terrorist G. Principle of the heir to the Austro-Hungarian throne, Franz Ferdinand. But a quick war did not work out and it dragged on for four years. For all the opposing sides, the war turned out to be very difficult, losses were estimated in the millions. In addition, the First World War led to the collapse of several empires, including the Russian, Ottoman, German, and Austro-Hungarian empires. But this war did not solve the issues that the countries set themselves and created the preconditions for the Second World War.