Science Advances

Supplementary Materials

This PDF file includes:

  • fig. S1. The number of dyads and contiguous dyads at different degrees of separation.
  • fig. S2. Conflict onset by degree of separation in the alliance network.
  • fig. S3. Interaction effect of degrees of separation and contiguity on the conditional probability of military conflict.
  • fig. S4. Endogenous goodness of fit.
  • fig. S5. Microlevel interpretations for pairs of states connected by higher-order alliances.
  • fig. S6. The persistence of alliance paths.
  • fig. S7. Modularity score of different community detection algorithms.
  • fig. S8. Maps of the international system in 1965, 1990, and 2000.
  • fig. S9. Hypothesized mediation model.
  • table S1. Contiguous dyads in the defensive alliance network in 1965.
  • table S2. Contiguous dyads in the defensive alliance network in 1980.
  • table S3. Contiguous dyads in the defensive alliance network in 2000.
  • table S4. Summary statistics for variables used in the TERGMs.
  • table S5. TERGM model robustness checks.
  • table S6. TERGMs using Maoz MID data as robustness tests.
  • table S7. TERGMs using Gibler and Littleā€™s nonprotest dispute data as robustness tests.
  • table S8. Logistic models for mediation analysis using Baron and Kenny's procedure.

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