Perhaps the single strongest unifying factor of pre-civil war southern whites was their

The correct answer is that the strongest unifying factor of pre-Civil war southern whites was their perception of white racial superiority

Explanation:

White southerns  main reason to fight the civil war was because they believed and wanted to keep the rigts to continue to enslave African Americans as they thought it was their right and it was protected by the constitution.

The whites believed they were superior than African Americans for a long time which ended up leading to 400 years of slavery.

angle a = 40.6°

step-by-step explanation:

for any right angle triangle we know the pythagoras theorem reveals

hypotenuse² = height²+base²

by this formula we will calculate the length of hypotenuse

h² = 6²+7²

⇒ h =√36+49 = √85 = 9.22

now from the given triangle sin a = height/ hypotenuse

                                                sin a = 6/9.22 = 0.651

therefore

so angle a = 40.6°