The Tang and Song dynasties.
Since many dynasties ruled throughout Chinese history, many leaders also brought golden ages as shown in these two dynasties.
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In general, the Industrial Revolution, which originated in Great Britain, opened up lots of new opportunities for employment for people, which created a solid middle class.
It’s less scary now, since we aren’t living through it.
It was never seriously considered. It was not used because it would have been to hard, as there was many failed attempts at it before.