The thesis point requires a defensible claim that establishes a line of reasoning, or that lists the analytic categories your essay will argue through. It does not require the exact phrase "this essay argues that."
"...slavery shaped nearly every dimension of American life, from politics to economics to regional identity, though its influence deepened rather than lessened as the young republic grew."
This earns the point because it establishes clear analytic categories - politics, economics, and regional identity - giving the essay a defensible line of reasoning to argue through, even without an explicit "this essay argues" framing.
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