What is the reason why slavery has existed for a long time in the West?

There are two main reasons for the long-term existence of western slavery:

1. The long-term existence of slavery in the West is due to its "low comprehensive production capacity" and "immature national culture". This means that under certain social and historical conditions, slavery may be an effective mode of production, because it can use slave labor to produce goods and services. In addition, some societies and cultures may regard slavery as a normal and necessary social system.

2. Another reason is related to the history of Roman Empire. The Roman Empire conquered a large number of foreigners by force and treated them as slaves. In the process of the establishment and development of the empire, slavery became an important economic and political system, because slave labor can provide a lot of wealth and resources. In addition, the population structure of the Roman Empire also made slavery exist for a long time, because the Roman population ratio was low, and the constant war and cultural level differences made slavery a necessary social system.