Actually even when you correct for socioeconomic factors, education, language etc there isn’t a physiological explanation for why the maternal & perinatal mortality rate is so much higher if you’re not white. Some of it may be due to complications that occur more commonly such as pre-eclampsia - but this affects white women too. As does diabetes, blood clots, infections.
It’s uncomfortable to think that people within the health service could be unconsciously racist or treat women who aren’t white less well. But if simply being black changes your likelihood of dying during or after birth, even if you have the same condition as a white woman may have, then you have to consider whether our health service gives as good care as it could to women and families of all ethnic backgrounds.
(Previous midwife here)