The United States passed the first forced sterilization laws before World War I. The Supreme Court case, Buck v. Bell, legalized the practice in 1927. Only one justice dissented, a conservative. It has never been overturned. Hitler openly said that the sterilization laws in the U.S. were models for his similar program.
Rockefeller money was behind much of this research. So was Carnegie money. So was Harriman money. The great foundations, funded by the great fortunes, funded it.