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Network Effects in Policy Diffusion: Evidence from U.S. State Legislatures

1 of 2 reviews received Waiting for Reviewers Overdue 69d
Editor
Sofia Reyes
Submitted
Aug 7, 2026
Due
Aug 28, 2026
Reviews
1 of 2
Status
Waiting for Reviewers
Author

Abstract

We study how policy innovations spread through the network of U.S. state legislatures using a stochastic block model fitted to 40 years of statutory adoptions. We find that geographic proximity and partisan alignment jointly explain over 60% of diffusion variance, with partisan homophily strengthening after 2010.

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