Dred Scott v. Sandford.

Dred Scott was a slave in Missouri, who ran away. Scott then resided in the area of Illinois, which was a free state. Dred Scott also was in an area of the Louisiana territory that under the Missouri Compromise did not allow slavery. When Scott returned to Missouri he sued stating that since he resided in a free territory, he was a free man. Scott lost in Missouri Courts. Scott then brought a new suite in federal court. "Scott's master maintained that no pure-blooded Negro of African descent and the descendant of slaves could be a citizen in the sense of Article III of the Constitution" (www.oyez.org).

The court had to answer the question of if Dred Scott was a slave or not? The court stated that Dred Scott was a slave under Articles III and IV. The court stated that no-one , but an actual citizen of the United States could be a citizen. Congress is the only one that can confer national citizenship. "The Court then held the Missouri Compromise unconstitutional, hoping to end the slavery question once and for all" (www.oyez.org)

The link i used was https://www.oyez.org/cases/1850-1900/60us393. This is credible, because it ends in an org, and cites other sources that it uses on its webpage.