The Maternal death rates in the 20th century reference article from the English Wikipedia on 24-Apr-2004
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Maternal death rates in the 20th century

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The death rate for women giving birth plummeted in the 20th century.

At the beginning of the century, maternal death rates were around their historical level of nearly 1 in 100 for live births. The number today in the United States is 1 in 10,000, a 99% decline.

The decline in maternal deaths has been due largely to better drugs and medical procedures such as prenatal care, increased prenatal care, better education, and the increase in expendable incomes to pay for all this.

See also : 20th century prenatal care