Arrange these events in chronological order:

(A) Dred Scott decision,

(B) Lincoln-Douglas debates,

(C) Kansas-Nebraska Act,

(D) Harpers Ferry raid.

C, A, B, D

Explanation:

C - The Kansas-Nebraska Act was passed as a bill in 1854 - that allowed territorial colonists to decide if slavery would be permitted within the borders of a new state.

A - The Dred Scott decision was a ruling by the Supreme Court in 1857 - which confirmed that the owners of slaves can take them into western territories.

B - The Lincoln-Douglas debates took place in 1858 - which centered on the issue of slavery in a series of seven debates by Abraham Lincoln and Stephen Douglas.

D - The Harpers Ferry raid happened in 1859 - by John Brown, who tried to instigate revolutions by slaves that require the use of arms.