Answer: sentence: We crossed an aqueduct before entering South Carolina.
Explanation: an aqueduct is like a bridge that goes over water . its an artificial channel for conveying water.
The disagreement over slavery is the root cause of separation.
B.
The overreach of state governments has provoked unnecessary conflict.
C.
The exercise of federal power has undermined the validity of the election.
D.
The failure of citizens to abide by the Constitution has driven the states apart.
Lincoln's words echo those of the seceded states in that D. The failure of citizens to abide by the Constitution has driven the states apart.
The opinion of Lincoln and the seceded states was that:
Both Lincoln and the seceded states therefore blamed the failure to abide by the Constitution for the breakdown in national unity between the North and the South.
In conclusion, option D is correct.
Find out more about the opinion of the seceded states at brainly.com/question/899038.