Borders, state leaders and military alliances
In 1914, the long-established world order began to crack apart, the 19th century system came to an end, and humankind entered a new age of unprecedentedly brutal conflicts in terms of their scale, the number of casualties and destruction.
Russia entered this war as an empire with a huge economic potential, expanding industrial production and confidence in its political influence. But Russia lost the war,the Tsar abdicated, the economy was ruined, and the fire of a Civil War swept through the country.
After losing four extremely influential empires, the European and global political mosaic reassembled into a new and extremely fragile world order, which inevitably led to World War II.