The Americas have seen a major demographic reshaping over the past century. Using historical census records and UN estimates, the data shows how the region shifted from a North-heavy population map in 1939 to a far more balanced distribution by 2025. 1️⃣ The United States stayed the largest — but grew slower than others. With about 138M people in 1939, the U.S. led the hemisphere by a wide margin. By 2025 it reached 347M, but several Latin American countries expanded at far higher rates, changin