Gold birg. Focused on how people think
It increased because industrialization & mass production came to replace lots of jobs. So a farmer for example was replaced by machines and so he and his family would have to move from a rural area (farm) to an urban area (city) to get work doing hard labor in factories. The size of cities also grew because at this time the railroads made getting from places easier than ever and allowed many people to move to cities. Cities were also were many companies would set up factories and workers moved their to be closer to their jobs
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Explanation:
Hitler was a pan-Germanic nationalist whose ideology was built around a philosophically authoritarian, anti-Marxist, antisemitic and anti-democratic worldview.
Stalin considered the political and economic system under his rule to be Marxism–Leninism, which he considered the only legitimate successor of Marxism and Leninism. The historiography of Stalin is diverse, with many different aspects of continuity and discontinuity between the regimes of Stalin and Lenin proposed.
Benito Mussolini was an Italian political leader who became the fascist dictator of Italy from 1925 to 1945. Originally a revolutionary socialist, he forged the paramilitary fascist movement in 1919 and became prime minister in 1922.