Movie S4.

Hierarchical clustering of the states in every year. This movie reflects 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 the full article. The social evolution of geographical correlations is very clear. This movie shows the results of the analysis performed on baby boy 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