now this gets me wondering, did white people back then try to control the reproductive rights of black people (or even kill black children or force black couples into aborting their children) to achieve this goal?

while modern Planned Parenthood has more-or-less moved beyond its racist roots, the organization's founder, Margaret Sanger, was a eugenicist and aligned herself with racist arguments to further the cause of birth control.

so, yes, white people did try to control, or at least influence, the reproductive decisions of black women.