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Answer: Slavery was a point of contention in the United States since the country's founding. The disagreement intensified as the 1800s began. In 1820, the Missouri Compromise established a boundary that wouldn't allow new slave states above this line. Dred Scott had been taken by his owner to an area in which slavery had been made illegal because of the Missouri Compromise.

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Answer:

His travels and residences in free areas.

Explanation:

The case Dred Scott v. Sanford was a landmark decision of the Supreme Court. In this case, Dred Scott, an enslaved black man, sued in court for his freedom. He argued that his owners had taken him from Missouri into the Missouri Territory, which was a "free" territory. The court ruled that Scott could not sue in court as he was not considered an American citizen due to his African ancestry, regardless of whether he was a slave or not.