Movie S3.

Hierarchical clustering of the states in every year. This movie describes the results of the analysis of the previous video and, though a different method, provides the same information about the evolution of the cultural areas of the United States. Details on the clustering method are given in SI Text, Principal Component Analysis and Hierarchical Clustering. The social evolution of geographical correlations is very clear. This movie shows the results of the analysis performed on baby girl names.

Cross-correlations of American baby names

Paolo Barucca, Jacopo Rocchi, Enzo Marinari, Giorgio Parisi, and Federico Ricci-Tersenghi

PNAS. 2015. DOI: 10.1073/pnas.1507143112