Who were some of the key figures involved and what was their role progressive era?

Ineed the answer ! what year was the 13th amendment passed in the us?

How was slavery in mesoamerica, africa, and the arab world similar? many enslaved people were forced to pledge loyalty to their owners. many enslaved people worked in exchange for protection from foreigners. many enslaved people were captured during war. many enslaved people taught and tutored children.

How did american entry into world war i affect the allied powers?