Counterfactual
The Parallel Lives of Mariama and Sierra
In 76 girls, Mariama found its level. 50 years earlier, Sierra occupied that same statistical address.
1971–2025
Mariama
Peak year
2024
Peak births
77
Latest count
76
Status
Stable
Peak generation
Gen Alpha
1940–2025
Sierra
Peak year
1998
Peak births
5,841
Latest count
476
Status
Endangered
Peak generation
Gen Z
In 76 girls, Mariama found its level. 50 years earlier, Sierra occupied that same address. One peaked in the Gen Z era; the other in the Gen Alpha world. They never met. But the data remembers them both.