The U.S. Treasury bond market is sending a clear signal: the Iran war is causing significant stress. As the conflict drags on, the market is responding with increased volatility and a rising risk premium, indicating a growing concern about the war's impact on the U.S. fiscal position and inflation. This is a critical moment for the bond market, which has historically been a powerful force in shaping economic policy. The market's reaction is a stark reminder of the bond vigilantes' role in the 1980s, where traders protested huge deficits by selling off bonds, pushing yields higher. This time, the market is sending a similar message, warning that the war's cost could lead to a bond market selloff as investors demand additional compensation to cover potential losses. The U.S. government faces a challenging situation as it must refinance $10 trillion of debt in the next 12 months, while the budget deficit is already on track to hit $2 trillion. The Iran war is widening, with Iranian allies in Iraq and Yemen, and Persian Gulf neighbors considering direct military action. This prolonged conflict is boosting borrowing costs and increasing the risk of a bond market selloff. The market's response is a clear indication that the war is impacting the U.S. economy in a significant way, and it will be crucial to monitor how the market reacts as the conflict continues. The U.S. Treasury bond market is a powerful indicator of economic health, and its response to the Iran war is a critical moment that could shape the country's financial future.