Ruling on people enslaved without Jihad, ruling on the slaves in Africa, and the conditions of enslavement

Q 1: What is your opinion - may Allah honor you - regarding people who are enslaved without Jihad (fighting in the Cause of Allah)?Q 2: What is your opinion - may Allah honor you - regarding the slaves that we have in South Africa; are they Shar`y (Islamic legal) slaves or not? When were they enslaved?Q 3: Is the slavery of those, Muslims or non-Muslims, who were enslaved during wars that took place between kings or countries for the sake of distinction and mastery in this world or during raids that powerful people used to wage against weak ones considered valid? Whether the answer is in the affirmative or in the negative, please mention the proofs for it from the Qur'an and Sunnah (whatever is reported from the Prophet).Q 5: How many conditions are there for the validity of slavery? What are these conditions?

A: Slavery is originally to capture non-Muslim prisoners of war during wars that take place between Muslims and Non-Muslims and Jihad for the sake of raising Allah's Word and supporting His Din (religion). (Part No. 16; Page No. 577) All other forms of slavery are impermissible such as that slavery which takes place without war or Jihad but through kidnapping free people, enslaving Muslims during wars between Muslim countries, or the selling of free people. The foregoing are all Haram (prohibited) forms of slavery through which ownership is not established. The conditions of validity of slavery along with the answers for questions no. 1, 2, 3, and 5 can be known through the consideration of the details mentioned above. May Allah grant us success. May peace and blessings be upon our Prophet Muhammad, his family, and Companions.