Muslim-majority populations grew nearly fifty percent from 1955 to 1970. [fact]
The main recruits to Islamism in the early 1970s were educated urban youth. Between 1955 and 1970, population growth in Muslim-majority countries approached 50 percent.
XREF: The demographic surge plausibly connects to youth-bulge theories linking population growth to radicalization and political upheaval.
Deepa Kumar, Islamophobia and the Politi…, loc. 340