This article asks whether U.S. public willingness to use force to defend allies depends on allies’ own defense investments. Using four survey experiments on samples of the U.S. public, the author examines how information about improvements in allied military capabilities affects respondents’ support for U.S. intervention and the perceived need for U.S. action. The study contributes evidence about how alliance burden‑sharing shapes public opinion and the possible domestic constraints it creates for alliance bargaining.
Four survey experiments U.S. public samples Focus on perceived need for intervention
Data and methods
The analysis draws on four survey experiments conducted with samples of the U.S. public, as reported in the abstract. The experiments manipulate information about allied military capabilities and measure respondents’ reported support for U.S. use of force to defend allies and related perceptions (for example, whether U.S. intervention is necessary).
Main findings
According to the abstract, improvements in allied military capabilities reduced U.S. public support for intervention by lowering respondents’ perceived need for U.S. action. The article describes this pattern as having implications for alliance bargaining—specifically, that allies’ investments may make it harder to credibly assure them they will not be abandoned if they concede—and as highlighting a potential confound in prior work linking lower costs or easier victory to greater public support.
- The experiments link allied capability gains to lower perceived need for U.S. intervention.
- The findings are presented as qualified implications for alliance bargaining credibility and interpretation of prior cost/ease of victory results.
