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.
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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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