Gates' purpose in telling the story about watching Nelson Mandela walk out of prison was to illustrate that there's hope for humanity.
Nelson Mandela was an activist. He fought for apartheid and discrimination against blacks in South Africa. He fought for the freedom of black people. This eventually led to his imprisonment.
Later he was eventually set free from prison. This represented hope to the people. It illustrated that we are all equal. This illustrated that there's hope for humanity.
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8 is in the place of 100'000
It depends on the situation...were they kicked out or did they willingly move out?
If they are kicked out then they are then homeless, but if they willingly moved out and moved into another place, they just simply moved.
Not sure if that is the answer you were looking for, but that's all I can give you unless you provide more details to your question. Hope it helped! :)