Okay, with no atomic bomb, and knowing only what Truman actually knew in 1945, I probably would have done one of the following:
- Accept conditional surrender:
Continue with the war as we had been doing, and by the end of August 1945, the Japanese would likely have been willing to sign an armistice. The Japanese military would cease all fighting and withdraw from the rest of the Pacific Theater and mainland Asia, and agree to disarmament. In return, we would lift the blockade and provide aid to their people.
This option would involve the least killing, of both military and civilians, so it seems reasonable. However, it would have been Versailles II. We learned our lesson from WWI, and the American people never would have accepted anything but unconditional surrender from the Japanese. Truman loses the next election and leaves office in disgrace, and once our military has withdrawn from the area, Japan rebuilds its military, goes back to its old tricks, and we’ve got WWIII on our hands in addition to the Cold War. Great.
So, let’s assume we’re only going for unconditional surrender now. What’s left?
- Isolate Japan, clean up the rest of Asia, and wait it out: Continue with the naval blockade of the Japanese home islands. Wipe out any remaining Japanese resistance in the South Pacific and Southeast Asia, and let the USSR invade China. This would eliminate the Japanese military from everywhere but Japan itself.
Using airstrikes, attack Japanese air bases, wiping out most of their air force (what was left of it) and giving us complete control of the skies. Concentrate resources into building more battleships and smaller naval vessels, and attack Japanese naval bases and shipyards from the sea. This would remove their capability to effectively fight outside their own borders. At this point, we could simply continue the blockade, and wait for Japan to surrender.
All of this could be done with relatively low civilian casualties, and Japan would no longer pose an immediate threat. In addition, once this was finished, American casualties would virtually cease. At first glance, it seems like a pretty good option. The problem is, we didn’t realize how bad the situation already was was for the people of Japan. Just in the first winter, millions would have starved and frozen to death, and instead of seeing pictures of burn victims from Hiroshima and Nagasaki, we’d now be seeing pictures of mass starvation. Even if we allowed food, medicine, and coal (since it can be used for heat but not for military vehicles) through the blockade, the Japanese government would still have kept most of it for themselves and their military, and left their people to starve. Under this plan, which appears the most humane at first, Japan in 1946 would look much like North Korea does today.
- Attack the Japanese military-industrial complex:
This would be pretty much what we had been doing up to that point, except without going through with the invasion. Again, the blockade would continue and we would eliminate Japanese resistance throughout the rest of Asia and the Pacific, but we would attack any military and industrial targets we could. Hopefully, once Japan was no longer able to wage war, they would surrender. If not, this option would still prepare us well for an invasion.
This would be even worse than the first option. We’d still cause all the starvation, but now we’d be killing more civilians in the bombings, too. We wouldn’t stop their weapons production, as they’d continue decentralization of their industry. Smaller plants would be scattered all throughout cities, with weapons being made in homes and schools - this is what the Japanese were doing anyway. If we wanted to continue this way, we’d have to accept that their civilians were all actively supporting the war effort, and destroy entire cities from the air, one at a time, as we had already been doing. Hmmm, now if only we had a more efficent way of wiping out their cities…
(Continued…)