I cannot imagine a world without WW2, the aftermath and the Baby Boomers that followed afterward. Without the baby boomers, certain TV shows may have not become successful, certain cars may not have been designed or built, the issue of human rights probably would not have been addressed until far later. Vietnam, the war protesters, rock bands like the Beatles, muscle cars, mid-engined supercars, I could go on and on. WW2's legacy still has an impact on us today. Not to mention technology like radar, and jet engined planes (that's a big one). I wouldn't trade it for anything.
Besides, would you really want a C&C Red Alert universe where the Soviets became the aggressors instead?