Harriet and Dred were enslaved at Fort Snelling in what is now Minnesota. But they argued that they should be freed. Why? A Harriet had regular contact with members of the Dakota A and Ojibwa tribes who told her this. B Slavery was outlawed in most lands that were north of a certain boundary, which included Fort Snelling. C 7 Missouri wanted to join the Union as a slave state. D 7 Dred was Emerson's servant at the fort's hospital.

## Step 1<br />The problem is a historical question about the Dred Scott v. Sandford case. Dred Scott and Harriet were enslaved at Fort Snelling in what is now Minnesota. They argued that they should be freed because slavery was outlawed in most lands that were north of a certain boundary, which included Fort Snelling.<br /><br />## Step 2<br />The options A, C, and D are not correct because they do not accurately reflect the historical context of the Dred Scott v. Sandford case. <br /><br />## Step 3<br />Option A is incorrect because there is no historical evidence that Harriet had regular contact with members of the Dakota and Ojibwa tribes who told her this.<br /><br />## Step 4<br />Option C is incorrect because Missouri's desire to join the Union as a slave state is not related to the Dred Scott v. Sandford case.<br /><br />## Step 5<br />Option D is incorrect because Dred's role as Emerson's servant at the fort's hospital is not relevant to the case.