During the first industrial revolution, the affected nations moved from a rural economy, based on agriculture and trade, to an urban, industrialized, mechanized, simplified and, thus, overcrowded economy. In 1800 it was possible to have a sustained growth of wealth that allowed the transition to a wide use of innovative machines, especially in transport and work, abandoning animal traction and production based on manual labor.
During the second industrial revolution The exponential development of railways, while structuring a new model of international trade based on the specialized production of each country and the exchange of materials from standardized prices, also enabled huge migratory movements, like boiler boats that even transported large masses of people on intercontinental trips, as was the case of the 55 million Europeans who migrated to North America between 1850 and 1940.
The cause of the great migrations during the second industrial revolution was, mainly, the tremendous demographic growth that there was in Europe during the eighteenth century, which in turn had different causes.
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The League of Nations didn't agree to decrease their armaments, but they decreased Germany's armaments
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Hitler did not invent the hatred of Jews. Jew is Europe had been victims of discrimination and persecution since the Middle Ages, often on religious grounds. Christians saw the Jewish faith as an aberration that had to be quashed. They were forced to convert or else were not allowed to perform certain professions.
In the nineteenth century, religion played a less important and was soon replaced by 'theories'. Theories regarding races and peoples. The idea that the Jews belonged to a different race than the Germans soon caught on. Even those who converted to Christianity were hated because of their bloodline.
Hitler was born in Austria in 1889. He developed his political ideas in Vienna, a city with a large Jewish community, where he lived from 1907 to 1913. In those days, Vienna had a mayor who was very anti-Jewish, and hatred of Jews was very common in the city. But it was not Hitler who invented the hatred. He only capitalized on anti-Semitic ideas that had been around for a long time.
During the First World War(1914-1918), Hitler was a soldier of the German army. At the end of the war Hitler, like many others, could not accept the defeat of the Germans. Soon rumors were spread that Germany was not defeated on the battlefield but by a 'stab-in-the-back'. In simpler terms they Germans were betrayed by the Jews and the communists, who wanted to bring the left-wing government to power. Hitler during the economic crisis became a stereotypical enemy of the Jews an the only way to bring end to the poverty, he thought, was execution of Jews and communists.
During the 1930s, Hitler did everything he could to expel the Jews from German society. Once the war had started, the Nazis resorted to mass murder. Nearly six million Jews were murdered during the Holocaust. The ideas that Hitler developed in the 1920s remained more or less the same until his death in 1945. What did change is that in 1933, he was handed the power to start realizing them.