The Roman Empire... collected taxes from up to 100 million subjects. This... financed... 250,000 - 500,000… — Yuval Noah Harari

The Roman Empire... collected taxes from up to 100 million subjects. This... financed... 250,000 - 500,000 soldiers, a road network still in use.., and theatres and amphitheatres that host spectacles to this day.

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