Europe never recovered from the carnage.
That war killed, on average, roughly 10,000 men a day, seven days a week, 52 weeks a year, for over four years.
And maimed many more.
Europe has never recovered.
I recommend a book called “1913”, about the world before WWI began. That war was one of the greatest, and most avoidable, catastrophes mankind ever inflicted on himself. It led to Communism in Russia, with its attendant waste and destruction of life (there and in other parts of the world), and it led directly to the rise of Adolf Hitler and an even more destructive war just 20 years later.