What were some of the "blessing of liberty" enjoyed by Northup before he left saratoga with his eventual betrayers?

Northup received an education, helped his father on the farm, read books, played the violin, got married, bought some land, and worked on the Champlain Canal. He played the fiddle at dances during the winter to make some extra money for his family. Than he moved to Saratoga Springs.... and his world unraveled.

what can we learn about slavery from the story of eliza