Which event symbolized the culmination of U.S. efforts to end the war in the Pacific?

The atomic bombings of Hiroshima and Nagasaki represented the culmination of U.S. efforts to end the war in the Pacific due to their decisive impact on Japan's surrender. These bombings occurred in August 1945 and were a pivotal moment in World War II. The intense destruction and loss of life caused by the atomic bombs forced Japan to reconsider its position and ultimately led to its unconditional surrender on August 15, 1945, effectively bringing the war to a close. This drastic measure was taken in the context of a fierce and protracted conflict in the Pacific, where other military operations, although significant, had not yet brought about the desired end to the war.

In contrast, other events listed, while vital to the Pacific campaign, did not individually lead to the war's conclusion. The Battle of Manila and the Battle of Okinawa were important military confrontations that showcased the U.S. military's abilities but occurred prior to the bombings and were part of the broader strategy to secure victory, rather than the final act that ended the war. The signing of the Tokyo Accord is not a historically recognized event linked to the war's conclusion, making it an inaccurate option in the context of this question. Thus, the atomic bombings stand out