The maternal mortality rate in the US is about 50% higher than in the UK for white mothers (8 versus 12), and the same for Black mothers (about 40): https://www.bbc.com/news/uk-england-47115305.
Asians, meanwhile, in the US have a maternal mortality rate of about 13, which would be 4x higher than Finland, but a life expectancy of over 86 years—several years longer than Japan or Korea, and 4 years longer than Finland. Indeed, the life expectancy of Hispanics in America is about the same as people in Finland.
It would be odd to see such disparities between maternal mortality on one hand and life expectancy on the other. Likewise it would be odd for Finland to be so much better than the UK. So I suspect there is more to the story than “large parts of America are a third world country.”
Could this really be a difference in fertility rate? The fertility rate in Finland is 1.46 children per women. The fertility rate of hispanics in the USA is 3.08, more than double that of Finland. The third (or more) child born to a woman is not equal in maternal mortality rate as the first child. The rate goes up with each child born. I don't know if we would expect it to go up to 4x higher, but certainly 3x higher wouldn't be unreasonable.
For non-hispanic black women, the death rate is a staggering 40.8 — that's over 13x higher than Finland!
Large parts of America are a third world country.