The exploitation of Black labor transitioned in both form and substance from 1860 to 1920. Craft a thesis statement and essay that analyzes the how and why of the transition from chattel slavery to sharecropping, convict leasing and debt peonage. you must: have: (1) a clear thesis statement, (2) provide the reader a clear sense of the direction of the essay and then (3) build out from that foundation. .