It is difficult to answer if the US could fight a four-front war. To prevent a war, the US must be prepared to fight and win conventional wars in multiple theaters at the same time and make investments to improve our allies' self-defense capabilities.

A war against Israel, an ally of the United States, was started by Hamas, an Iranian terrorist organization, while President Biden was trying to renegotiate the Iran nuclear deal. Foreign policy professionals acknowledge that the United Sta...