How did the dred scott decision influence the presidential elections of 1860?
a. the decision gave rise to the know-nothing party, which won the election.
b. the decision gave rise to the free soil party, which won the election.
c. the decision strengthened the democratic party, which won the election.
d. the decision strengthened the republican party, which won the election.

The correct answer of the given question above would be option D. The Dred Scott decision influenced the presidential elections of 1860 since the decision strengthened the Republican Party, which won the election. This outcry over the Dred Scott decision urged Northerners to vote Republican, to represent their stance against slavery, by electing Abraham Lincoln as President of the United States in 1860. Hope this answers your question.

D.successful because there were no legal protections for unions.