What did Douglas argue in what became known as the Freeport Doctrine?

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Douglas argued that settlers could ban slavery in their own territories by not passing laws to protect slave property, which became known as the Freeport Doctrine. This idea contradicted the Dred Scott decision and infuriated Southerners who believed that property rights (including slave property) were protected by the Constitution, regardless of the will of the people living in a territory.

What Did Douglas Argue in What Became Known as the Freeport