Well the united world government wouldn't have come into being in the 60's i can tell you that much.
Would have been a fractured world full of squabbling ideologies. and with the scientific advances of the 40's and 50's you may have seen a Nuclear War or mass biological attacks. can you imagine over a hundred independent nations trying to get the league to do anything? <shakes head>
after the Lindbergh-Ford ticket took the white house in 40 and began supporting the Germans, esp after the quick fall of France. when the British looked doomed to fall, They quickly overran Canada, insuring they were full axis members. after that well .. the rest is history..
Japan / china was split between Russia and the US.
Europe and North Africa fell to Germany with the remainder being split amongst them. It was Amazing they never skipped a beat even after Hitler was declared insane and removed to retirement buy the military (supposedly for talks of invading betraying the Soviets.)
North and South America was now just the United States of the America's
The world is a balanced Socialist-Capitalist society now. we even have bases on the moon and now men are walking on mars can you believe that?!?