World War II lasted 6 years
Johannes Gutenberg famously printed the Bible on his printing press. This was a significant moment in history because it allowed many more people to read the text and form their own interpretations.
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The russians practiced communism where as the west (usa,britain,france) were anti communist. the us were capitalists , thus is would make sense that the ussr and the usa would clash eventually despite their pasts of helping eachother out. once russia clashed with the west it gave way to the cold war