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In waging war against Japan, one of the most effective long-term strategies was the island-hopping campaign employed by the Allies during World War II. This strategy involved bypassing heavily fortified Japanese-held islands and capturing strategically important islands that were not as heavily defended. By doing this, the Allies were able to establish airfields and naval bases closer to Japan, gradually advancing towards the Japanese mainland while cutting off Japanese supply lines and isolating their forces on bypassed islands.
The island-hopping strategy allowed the Allies to avoid costly frontal assaults on every Japanese-held island, conserving resources and manpower for decisive battles. It also put pressure on Japan by encircling and weakening their positions, forcing them to spread their forces thin across the Pacific theater.
Additionally, the use of code-breaking efforts like ULTRA, which involved intercepting and decrypting Japanese communications, provided valuable intelligence to the Allies, enabling them to anticipate Japanese movements and plan their operations effectively.
In summary, the island-hopping campaign and code-breaking efforts were two key elements that proved most effective as long-term strategies in the Allied war against Japan during World War II.