The new report also reveals some important differences per state in fertility rates.
Overall, the total fertility rate for the United States in 2017 was 1765.5 per 1,000 women, which was 16% lower than what is considered the level a population needs to replace itself: 2100 births per 1,000 women, the report.
The researchers found that South Dakota, at a rate of 2,227.5, and Utah, at a rate of 2,120.5, were the only states with a total fertility rate above the replacement level in 2017.
The report also showed differences in total fertility rates per breed: in non-Spanish white women, none of the states had a fertility rate above the replacement level; 12 states among non-Spanish black women; and 29 states among the Spanish women.
For non-Hispanic white women, the highest total fertility rate in Utah was 2,099.5 and the lowest in the Columbia District was 1,012.
Among non-Hispanic black women, the highest total fertility rate in Maine was at 4,003.5, and the lowest in Wyoming, at 1,146.
For Spanish women, the highest fertility rate in Alabama was at 3,085, and lowest in Vermont, at 1,200.5, and Maine, at 1,281.5.
The report had some limitations, including that for some groups of women the number of births used as a basis for calculating the total fertility rate was small.
But generally speaking, although nearly all states have a total fertility rate indicating that their total population will increase as a result of births, these results show that there are differences in fertility patterns in states between groups according to race and Spanish origin, " the researchers wrote in the report.
Earlier research has shown that the US birth rate in 2017 is a record low & # 39; showed, when the number of births nationwide was the lowest in three decades.
& # 39; There is concern & # 39;
"We have seen fertility rates drop and I think it has a lot to do with women and men, especially couples, who have much more control over their reproductive life," Benjamin said.
When we consider the rates over longer periods, remember that we come from a peak in the baby boom generation, so it is also kept up to date by the very high baby boom we had after the Second World War, and so you are really going to reductions of that look at it, "Benjamin said.
"I think that care – and there is a concern – is a fertility rate that does not allow us to perpetuate our society," he said. "But we can sometimes turn around or turn around after a while, but that remains to be seen."