The IESG wrote:
[1] https://datatracker.ietf.org/doc/draft-knodel-terminology/
US centric view of the draft as if only blacks were slaves is totally wrong only to make people in other part of the world or with knowledge on world history upset or angry. For example, Christianity was banned in medieval Japan because Christians exported many Japanese as slaves. For another example, in ancient Greece, many white people were enslaved. As "slave" has long established meaning having nothing to do especially with blacks in recent (that is, for these 100 or 200 years) US, it is stupid to ban it. Or, should we avoid talking on ancient Greece, because slavery was common? Masataka Ohta