What argument did Scott use to sue for his freedom?

In 1846, after laboring and saving for years, the Scotts sought to buy their freedom from Sanford, but she refused. Dred Scott then sued Sanford in a state court, arguing that he was legally free because he and his family had lived in a territory where slavery was banned.

Explanation:

d) a week

because the land run of 1889, although not without precedent in the history of the west, further, their men were aboard the first trains, ready to jump off and begin staking their claims. oklahoma city, edmond, and guthrie were all so affected.

the speech revealed that eastern european countries were no threat to their neighbors, which led to the creation of the truman doctrine i think this might be correct.