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What does it mean in the declaration of independence for cutting off our trade with all parts of the world

Part a: which statement identifies the central idea of the text? a: the north was more powerful than the south and was always going to be the victor of the civil war. b: despite the obvious strength of the north, the outcome of the war was unpredictable at the time. c: the united states underestimated the strength of the south, giving it the upper hand. answer !

Why do you think jefferson thought lewis was qualified to explore the louisiana purchase? ?