"Although U.S. infant mortality declined by 20 percent between 1990 and 2010," the report notes, "other high-income countries experienced much steeper declines and halved their infant mortality rates over those two decades."
As to what explains the high infant mortality rate, the researchers aren't quite sure. They say it is not explained by ethnic diversity in the United States. While U.S. minorities do tend to have a higher infant mortality rate, non-Hispanic whites in the United States also have worse outcomes than those in peer nations.
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