Day: March 12, 2025

Domestic regime type affects both inter-state conflict and alliance formation. Democratic peace theory posits that democracies do not go to war with one another, while democratic alliance theory suggests that they rarely, if ever, join nondemocratic alliances (or alliances led by nondemocratic powers). Empirical evidence strongly supports both theories. The Atlantic Council’s Freedom and Prosperity Index further reinforces the hypothesis that economically prosperous democracies tend to align with one another, whereas authoritarian states gravitate toward similarly nondemocratic and less prosperous partners. 

If these theories hold, they carry significant implications for Western and especially US foreign policy. First, global democratization would reduce the number of potential conflicts, at least among an increasing number of democracies. Second, it would expand the pool of democratic alliance partners, while at the same limiting the alliance options available to nondemocratic powers. This strategic logic underscores the importance of upholding democratic norms abroad and promoting democratization in nondemocratic states. 

However, advocating for democratization of nondemocratic great powers will be perceived as both a geopolitical and domestic political challenge aimed at weakening their international position  and threatening their governments’ domestic grip on power. Efforts to democratize nondemocratic great-power like Russia and China therefore provoke intense countermeasures. If such a strategy is deemed to be too high risk or too difficult to pursue successfully, a less provocative, “peripheral” strategy may focus on fostering democracy and economic development in authoritarian regimes’ weaker, less prosperous partners, thereby depriving them of potential allies. 

Fellow

Markus Jaeger

Senior Advisor

Freedom and Prosperity Center

Central Europe
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The post Why democracies stick together: The theory and empirics behind alliance formation appeared first on Atlantic Council.