Which time period has seen more extensive/substantial changes in human history?
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It is a binary comparison. Based on this, you seem to think 1920-1970 > 1970-2020.
Yes, though the difference isn't dramatic. Peak rate of change was probably the transition from pre-industrial to industrial, though the period that spans the 2 world wars is also a strong contender. Change since WW2 has generally been a bit slower, despite the digital revolution
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Overall I'd say the pre-industrial world saw a linear rate of change, and the industrial and post-industrial worlds also see linear rates of change. What was non linear was the transition between the two
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1920-1970 one has seen a huge/painful transition of pre-modern era, to modern era. My grandparents have grown up without electricity, radio, and washing machine and cars were only for the top-1% back then. By 1970 nacism and communism were mostly done with.
End of conversation
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