While there are contributing factors, like women having children later in life and the ongoing obesity crisis, it's the American healthcare system that's truly to blame. Southern states suffer the worst, thanks to issues with insurance coverage and access to care, not to mention the scourge of unnecessary C-sections. Failing health coverage in poorer areas has gotten so bad that Native and African American mothers are dying at triple the average rate.
But sometimes it doesn't matter who you are, because hospital staff in America are simply doing a piss-poor job of keeping women alive. A lack of education, shaky protocols, and a general inability to recognize problems might seem unthinkable in the nation that launched an electric car filled with potentially deadly microbes into space, but it's the current reality, and many hospitals won't change procedures until they have an untenable amount of dead moms on their hands.