Why did Truman decide to use the atomic bomb on Japan

i need 3 ideas and i already have
---less casualties
---it would end the war

Any more i just need one?

It was available

it would save American lives, maybe save Japanese lives (soldiers were not giving up, but dying in battle)
it would end the war much sooner than invading japan
He wanted to end the war.
He was tired of americans dying on stupid islands inthe pacific fighting suicide fighters.

well im trying to write an essay to persuade truman to use it we have to go back in time so i will tell him it would end the war fast and saver others life

but i don't know what you suggested would fit in well thank you though(:

Of course what Bobpursley suggested fits in with your essay.

His first point is that the atomic bomb was available. No military force deliberately ignores a weapon that is effective and has been developed at a great cost of money.

The reasons that Truman dropped the bombs were:

It was an available and efficient (though horrific) weapon.

It would save thousands of American lives.

It would end a lengthy and deadly war much quicker than an invasion of Japan.

Another reason for Truman's decision to use the atomic bomb on Japan was to demonstrate the power and capabilities of the United States to the world. This idea can be supported by the following details:

1. Deterrence and Cold War dynamics: Truman hoped that the use of the atomic bomb would serve as a deterrent to the Soviet Union and other potential adversaries. By showcasing the destructive force of nuclear weapons, the United States aimed to prevent countries from challenging its global influence during the emerging Cold War era.

2. Diplomatic leverage: Truman and his advisors recognized that employing the atomic bomb would give the United States an advantage in post-war negotiations, particularly with regards to Japan's surrender terms. The bomb's devastating impact allowed the United States to establish itself as a key player in shaping the post-war world order.

3. Military justification: Truman also believed that using the atomic bomb could potentially save the lives of American soldiers. An invasion of Japan was deemed necessary to achieve complete victory, but it was anticipated to result in extremely high casualties. By demonstrating the immense destruction caused by the atomic bomb, Truman aimed to compel Japan to surrender without the need for a bloody and protracted ground invasion.

To further understand Truman's decision-making process and rationale, it is advised to reference historical documents, such as his correspondence with advisors, memoirs or speeches, and accounts from those involved in the decision-making process.