It would be a class system. Hope i helped
Stress signals are the ways you express stress for example: ruminating thoughts, shaking of legs, pacing.
Stressors are things that stress you, for example relationship problems or exam.
while you have to answer this question for yourself, I can give you some examples:
shaking before an exam
ruminating thoughts before meeting parents
pacing before a flight
Answer:
It's because Douglass regarded the Civil War as the fight to end slavery, but like many free blacks he urged President Lincoln to emancipate the slaves as a means of insuring that slavery would never again exist in the United States.