The following are four different ways in which the United States could have ended a war with Japan:
1. Recognizing Japan's invasions: Japan has invade China and other South-Eastern countries. In order for the United States to end the war, they could have recognized Japan's invasions as legitimate.
2. Blocking all trade routes: Japan was technologically advanced but resource poor. The country depended on importing raw materials for their war industry and a blocking of trade routes could easily dismantle the country's capabilities to fight.
3. Indirectly supporting China: China was a vast land with millions of people. The United States did not support China, either militarily or financially when Japan invaded. If the US could spur an insurgency in China against Japan, it would have seriously damaged Japan's ability to keep on fighting.
4. Nuclear Threat: Instead of dropping the Bomb on an urban population, the Bomb could have been dropped on less densely populated areas such as the mountains, forests or even the beach as a threat to the Japanese King.