Exhibit A in the dangers of relying exclusively on birth rates to make predictions:
In the United States the lower birth rate of the Anglo-Saxons has lessened their economic and political power; and the higher birth rate of Roman Catholic families suggests that by the year 2000 the Roman Catholic Church will be the dominant force in national as well as in municipal or state governments.
– Will and Ariel Durant
The Lessons of History, pg. 23
(Simon and Schuster: 1968)