He could end the war with a vicious weapon of mass destruction known to mankind, which was the atomic bomb. American soldiers where fighting the Japanese in a long four-year war even though the Americans occupied a lot of territories for example, The Okinawa and Iwo Jima and more. In addition, they fire bombed most Japanese cities but the Japanese where strong in military capacity, they where large in numbers, two million strong and still fighting. That was one of the reasons why President Truman wanted to end the war. Another reason is that, The U.S told the Japanese to surrender leadership and end war but the Japanese refused that demand which escalated to living with President Truman to execute his decision on releasing the bombs. Even though there was a lot of indication and hints that surrender was possible under some conditions. In addition, There where Japanese peace feelers being presented and spread all over the U.S government. On July, 1945 the Japanese ambassador at Moscow at that time [24 July, Diary Entry, Japanese peace feelers, Diary], they began sending message to Tokyo in the response of the possibility of the outcome to use The Russians as a intercessor for peace. The ambassador tried but the only the Russians could is to listen to the messages. They responded finally by saying that a war must be fought with all the bitterness and vigor of which the nation was capable because the only alternate was unconditional