CHICAGO — America may be the world's superpower, but its survival rate for newborn babies ranks near the bottom among modern nations, better only than Latvia.

Among 33 industrialized nations, the United States is tied with Hungary, Malta, Poland and Slovakia with a death rate of nearly 5 per 1,000 babies, according to a new report. Latvia's rate is 6 per 1,000.

"We are the wealthiest country in the world, but there are still pockets of our population who are not getting the health care they need," said Mary Beth Powers, a reproductive health adviser for the U.S.-based Save the Children, which compiled the rankings based on health data from countries and agencies worldwide.

The U.S. ranking is driven partly by racial and income health care disparities. Among U.S. blacks, there are 9 deaths per 1,000 live births, closer to rates in developing nations than to those in the industrialized world.

"Every time I see these kinds of statistics, I'm always amazed to see where the United States is because we are a country that prides itself on having such advanced medical care and developing new technology ... and new approaches to treating illness. But at the same time not everybody has access to those new technologies," said Dr. Mark Schuster, a Rand Co. researcher and pediatrician with the University of California, Los Angeles.

The Save the Children report, released Monday, comes just a week after publication of another report humbling to the American health care system. That study showed that white, middle-aged Americans are far less healthy than their peers in England, despite U.S. health care spending that is double that in England.

Researchers noted that the U.S. population is more racially and economically diverse than many other industrialized countries, making it more challenging to provide culturally appropriate health care.

About half a million U.S. babies are born prematurely each year, data show. African-American babies are twice as likely as white infants to be premature, to have a low birth weight, and to die at birth.

The researchers also said lack of national health insurance and short maternity leaves likely contribute to the poor U.S. rankings. Other possible factors in the U.S. include teen pregnancies and obesity rates, which both disproportionately affect African-American women and also increase risk for premature births and low birth weights.