Why did the Prophet (peace be upon him) buy one slave for two black slaves, and why did he enslave two slaves to get one slave, and why are black slaves mentioned when we are all equal regardless of race?

Slavery was widespread in its most brutal forms before Islam. Then Islam came and forbade the selling and enslavement of free people. It permitted enslavement only for those captured through legitimate jihad as a response to enemies, and it strongly encouraged the manumission of slaves. There was no intentional targeting of Black people as slaves; rather, it depended on who the Muslims captured from the disbelievers. Therefore, there were both white and black slaves. There was indeed a differentiation in the value of slaves based on color, status, or lineage. An example of this is the Prophet's (peace be upon him) purchase of Safiyyah bint Huyayy for seven heads (of slaves) because she was the mistress of her people. In another incident, the Prophet (peace be upon him) purchased a slave who had pledged allegiance for emigration in exchange for two black slaves, so as not to turn him away disappointed. This demonstrates the Prophet's (peace be upon him) noble character. Thus, slavery is not related to color or race, but rather to those whom Muslims capture from the disbelievers, and the variation in the value of slaves is due to people's desires, not to Islamic law.