1. Total maternal deaths are 650 to 750 per year in the United States [1].
2. Accidental deaths by all causes total about 80,000 per year for ages 5-44 [2] (here I am eyeballing the Tableau chart by age group).
3. The risk of a 5-year-old dying in their 40s in the US is about 4x that in peer countries like the UK [3].
Putting #2 and #3 together, we would have to reduce yearly US accidental deaths for ages 44 and below by 4x to reach parity with peer countries. We'd have to go from 80,000 deaths per year to 20,000, meaning we'd need to save 60,000 lives per year from accidental death causes such as drug overdoses, vehicle accidents, and homicide.
Bringing the US maternal mortality rate down to the EU rate, while highly desirable, would only save a few hundred lives per year, a fraction of a percent needed to close the gap.
[1] https://www.commonwealthfund.org/publications/issue-briefs/2...
[2] https://injuryfacts.nsc.org/all-injuries/deaths-by-demograph...