Why did Southern plantation owners favor the Dred Scott decision?

1.The Supreme Court declared slaves to be property.
2.The Supreme Court declared all states slave states.
3.The Supreme Court declared slavery in all territories.
4.The Supreme Court declared the end of slavery in all states.

1. The Supreme Court declared slaves to be property.

Southern plantation owners favored the Dred Scott decision primarily because it declared slaves to be property. This decision upheld the concept of slavery and solidified the legal rights of slaveholders to own and control their slaves as property. It strengthened the position of plantation owners in the South and protected their economic interests. The decision also provided them with legal protection against potential challenges to the institution of slavery.