Final answer:
Scott's argument for freedom in the Dred Scott v. Sandford case was that when he lived on free soil, he became free.
Step-by-step explanation:
In the context of the Dred Scott v. Sandford case, Scott's argument for freedom was that when he lived on free soil, he became free. Scott had been taken to free territories such as Illinois and Wisconsin, where slavery was prohibited. He argued that his time spent in these free areas should have made him a free man.
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