He could not identify the cause of continental drift.
Answer:
Student Nonviolent Coordinating Committee
Explanation:
Student Nonviolent Coordinating Committee (SNCC), also called (after 1969) Student National Coordinating Committee, American political organization that played a central role in the civil rights movement in the 1960s.
I think this is the correct answer, but let me know if it is incorrect. People were having more children per family.