What is particularly important to keep in mind is that any given wire of the cage may or may not be specifically developed for the purpose of trapping the bird, yet it still operates (together with the other wires) to restrict its freedom. By the same token, not every aspect of a racial caste system needs to be developed for the specific purpose of controlling black people in order for it to operate (together with other laws, institutions, and practices) to trap them at the bottom of a racial hierarchy.
