alt Hacker NewsIn this world we've had an inocculation event against use of nukes. Two were dropped, people have seen how abhorrent their use is and collectively decided that they shouldn't be used.
If in the WW2 Japan also had nukes (and delivery systems for them) they'd probably have retaliated in kind and US wouldn't let that slide too and it would have continued for some time.
If WW2 Japan also had nukes the US would never drop those two. That's the whole idea behind MAD. Probably the only thing that stopped an open conflict between the US and USSR was them being nuclear powers and both sides being scared that eventually push comes to shove.