In the 1920’s,but（ ）in the Depression conditions of the 1930’s,the United States experienced a declining birth rate—every thousand women aged fifteen to forty‐four gave birth to about 118 live children in1920，89.2 in 1930，75.8 in 1936,and 80 in 1940.

In the 1920’s,but（ ）in the Depression conditions of the 1930’s,the United States experienced a declining birth rate—every thousand women aged fifteen to forty‐four gave birth to about 118 live children in1920，89.2 in 1930，75.8 in 1936,and 80 in 1940.