Japan’s pacifism has never existed in isolation. Since the end of World War II, Japan has limited the role of its own military power while relying heavily on the security relationship with the United States. This is one reason Article 9 has been able to survive for so long.
The basic arrangement is often described as a security bargain. Japan keeps a pacifist constitution and limits the use of force, while the United States helps protect Japan and maintains military bases in the country. For decades, this arrangement allowed Japan to focus on economic growth while avoiding the burden of becoming a major military power.
This system also created a difficult tension. On one hand, the US alliance has provided deterrence. It has made potential attackers think carefully before threatening Japan. On the other hand, the presence of US bases has been controversial, especially in Okinawa, where many of the bases are concentrated. For local communities, the alliance is not only an abstract security policy. It affects land use, noise, accidents, crime concerns, and daily life.
For foreigners, this is an important point to understand. Japan’s pacifism has not meant complete separation from military power. Instead, Japan has depended on an ally’s military presence while keeping its own use of force limited. This is why some Japanese people support the alliance as necessary, while others feel uncomfortable with the heavy dependence on foreign military power.
In recent years, the debate has become more complicated. China’s military build-up, North Korea’s missiles, tensions around Taiwan, and uncertainty about US politics have made some Japanese people question whether Japan can rely on the same security structure forever. If people are less certain that the United States will always protect Japan, they may become more open to strengthening Japan’s own defense capabilities.
Still, reliance on the United States is not simply a weakness. Alliances are part of modern security. Many countries depend on partners to manage risks they cannot handle alone. The question for Japan is how to balance three things: its pacifist principles, its alliance with the United States, and its need to protect itself in a more difficult region.
This is why the US alliance matters in any discussion of Article 9. Japan’s pacifist constitution, its Self-Defense Forces, and the American military presence are not separate issues. They are parts of the same postwar security system.
