In Japan, for example, the US occupation after World War II offered an opportunity for American bureaucrats to push abortion policies they couldn't win support for in the United States.

As part of a larger agenda of pushing a Japan-style New Deal and other US-styled interventionist policies, the US occupiers were more than happy to help the new Japanese regime impose a eugenics-friendly program designed to combat alleged overpopulation. According to Holly Coutts:

The centralized government in Japan, coupled with a political culture infused with socialist ideas and traditional loyalty to a strict hierarchy, allowed policymakers to create a far-reaching program. This same type of program was impossible in the US and South Korea [another country under heavy US influence] as it would not have corresponded to their public ideas…