Oh my goodness, the question is so complicated.
I'll move quickly. Around 600, certain Middle Eastern civilizations were engaged in the earliest stages of socialism.
In addition to odd anomalous historical instances, Marx and the communist manifesto come to mind. Without this philosophical essay, socialism would never have emerged as the present communist revolution. According to Marx, socialism is the next stage for countries to take in achieving ultimate communism. He saw that it would be difficult to transition from capitalism to a fully decentralized communist society, so he decided that the state should seize control of everything, divide it up, and start moving in the right direction. Naturally, corruption comes when you give the state power over everything, and death frequently follows.
The spread of Marxist ideology led to the emergence of communist parties everywhere. During World War One, Russia would finally adopt it. The Russian Tsar (monarch) assumed direct control of the Amry throughout the conflict, which resulted in a disastrous outcome. Numerous battles saw Russia cruelly destroyed, and millions of Russians are now in the grave. The Tsar's demise was a result of this added to the fact that he was a weak, unpopular ruler. In 1917, he was deposed and then murdered. The Duma (essentially a Russian senate) assumed control but maintained Russia in the conflict. The already well-liked Bolsheviks were furious and sparked a civil war as a result. Vladimir Lenin led the Bolsheviks to victory and the creation of the USSR. The first socialist state is this one.
Because they usually do, many individuals will declare "there is no actual socialist state," but I want to caution you that this is mostly untrue. Marxist design and modeling have been used to create communist nations. Although there were variations, each one showed the fundamental characteristics of socialism. Tens of millions of Russians perished during the Stalinist purges, and freedom was a long-forgotten ideal. Due to Maoist policy, almost 40 million people in China perished from famine. The two greatest and most fervent socialist countries in history both developed into dreadful murderous regimes. Since it is difficult to refute this truth, they will counter that the USSR was indeed socialist. The truth is that socialism has been tried all throughout history, including in large, resource-rich countries like North Korea and the USSR, and it has consistently failed. Simply said, the USSR, or United Soviet Socialist Republics, was a socialist nation.