"...to defend the subordination or even extermination of..."

"...but in a larger sense the Southerners were sharing in, and taking advantage of, the general shift toward racialist thinking in Europe and the United States. This racialist thinking was used to justify more than the southern institution of slavery. It served to defend the subordination or even extermination of non-European peoples throughout the world and was believed by Europeans to explain the ever-increasing gulf of power and progress that separated them from the peoples they were overrunning."

-- Race and Manifest Destiny: The Origins of American Racial Anglo-Saxonism, Reginald, Horsman, 1981, p. 122.