Both the fall of Han dynasty and the fall Roman empire has been accounted from the incoming pressure they had from internal and external influences. These influences had changed them and making them fall eventually.
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This diary entry could definitely be used to support Engels's claims as it describes the conditions as being crowded and filthy and shows that the working class was meaningless to the government at that time and that they were forced to work and live under horrendous conditions.
2. Many slave codes prohibited enslaved people from learning to read and write
7 is an opinion but 6 is a fact