Concept

Key events of the 20th century

Summary
The 20th century changed the world in unprecedented ways. The World Wars sparked tension between countries and led to the creation of atomic bombs, the Cold War led to the Space Race and the creation of space-based rockets, and the World Wide Web was created. These advancements have played a significant role in citizens' lives and shaped the 21st century into what it is today. From 1914 to 1918, the First World War, and its aftermath, caused major changes in the power balance of the world, destroying or transforming some of the most powerful empires. World War I The First World War (or simply WWI), termed "The Great War" by contemporaries, started in 1914 and ended in 1918. The war and by extension the century as a whole was ignited by the Assassination in Sarajevo of the Austro-Hungarian Empire's heir to the throne, Erzherzog Franz Ferdinand, by Gavrilo Princip of the organization "Young Bosnia," Bosnian Serbs' liberation movement. Bound by Slavic nationalism to help the small Serbian state, the Russians came to the aid of the Serbs when they were attacked. Interwoven alliances, an increasing arms race, and old hatreds dragged Europe into the war. The Allies, known initially as "The Triple Entente", comprised the British Empire, France, Italy, and Russia. Germany, Austria-Hungary, Bulgaria, and later the Ottoman Empire, were known as "The Central Powers". The assassination of Franz Ferdinand started dramatic changes that would last for several decades into the 20th century, similar to how the 9/11 was the inciting incident of the 21st century. In 1917, Russia ended hostile actions against the Central Powers after the fall of the Tsar. The Bolsheviks negotiated the Treaty of Brest-Litovsk with Germany, although it was a huge cost to Russia. In the treaty, Bolshevik Russia ceded the Baltic states to Germany, and its province of Kars Oblast in the South Caucasus to the Ottoman Empire. It also recognized the independence of Ukraine.
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