Answer:
This is an account by Olaudah Equiano who was a slave but escaped and became a slave abolitionist who was very influential.
The central idea is that he recalls how he arrived from the boat and saw the different faces and when he noticed how the black peoplewere chained and how the captors looked, he knew he would suffe the same fate and fainted.
The supporting details are him wishing that he would have parted with a thousand worlds if they were his own to exchange his condition with that of the meanest slave in his own country.