The Cultural Evolution of National Constitutions

TL;DR

This study applies models from epidemiology and genetics to analyze the evolution and inheritance patterns of 591 national constitutions from 1789 to 2008, revealing complex borrowing and innovation dynamics.

Contribution

It introduces a novel approach using topic modeling and diffusion networks to uncover cultural inheritance and innovation in constitutional development.

Findings

Constitutions are complex recombinants with systematic borrowing patterns.

Inheritance follows a biological-like preferential attachment process.

Identifies influential constitutions that shape constitutional evolution.

Abstract

We explore how ideas from infectious disease and genetics can be used to uncover patterns of cultural inheritance and innovation in a corpus of 591 national constitutions spanning 1789 - 2008. Legal "Ideas" are encoded as "topics" - words statistically linked in documents - derived from topic modeling the corpus of constitutions. Using these topics we derive a diffusion network for borrowing from ancestral constitutions back to the US Constitution of 1789 and reveal that constitutions are complex cultural recombinants. We find systematic variation in patterns of borrowing from ancestral texts and "biological"-like behavior in patterns of inheritance with the distribution of "offspring" arising through a bounded preferential-attachment process. This process leads to a small number of highly innovative (influential) constitutions some of which have yet to have been identified as so in the current literature. Our findings thus shed new light on the critical nodes of the constitution-making network. The constitutional network structure reflects periods of intense constitution creation, and systematic patterns of variation in constitutional life-span and temporal influence.