Well, there may or may not have been a war in europe, but a war in the pacific involving the US would still have happened. It wouldn’t have lasted as long, but might have been more bloody while it lasted, as there would’ve been less time for effective weapons to develope and mature. The Atom bomb might have never been developed (or been developed too late to be used), and that would mean that manpower would have had to substitute for firepower. Japanese casualties in the island campaigns would’ve been about the same, but American casualties would’ve gone way up. An invasion of the Japanese home islands, however, would’ve been bloody in ways I hate to think about. 10’s of millions of casualties. That said, without an European war, England, Austrailia, and New Zealand would’ve been along side in the fight against Japan to some degree or another, and with all the armaments going against Japan, well, I’d say the war would’ve been mostly done about '43 or '44.
The British Empire would likely have stayed intact to some degree, the USSR would’ve mostly stayed a backwater, and may’ve actually been more successful for having done so. Without the widespread desruction of infrastructure, the starvation and loss of life, the USSR would’ve been able to meet most of it’s own needs, and without the paranoid milatarism that the German attack stoked, the USSr would’ve likely not bankrupted itself trying to directly compete with more efficient economies.
The War in Afganistan may still have happened, but it would have lasted longer, and been less bloody in any one particular year. It likely would’ve been a slow bleeding wound in the USSR’s southern flank for decades.
Isreal would likely never have been created.
Italy and France would likely still be the dominant players in North Africa.
China might have become partitioned between Mao’s communists and Sheck’s nationalists, as Mao would’ve had less time to build and train his forces, and less time to consolidate his territorial control.
There’s lots more, but that’s my first, thoughtless stab at it.