In the mid-twentieth century, most single-parent families came about because of the death of a spouse.
Developmental psychologist Nancy Bayley authored the Bayley Scales of Infant Development in the mid-twentieth century.
In the early and mid-twentieth century, the prevailing view of runaways underwent a partial shift in emphasis from crime to pathology.
During the early to mid twentieth century, when Arthur Murray dance studios and others were spreading over the nation, these contests were well-attended and established.
The city was reborn as a ski resort destination in the mid-twentieth century and has seen substantial growth in recent years.