Germany was trying very hard to avoid going to war against the United States. We were sending massive amounts of arms to the British, and our forces were attacking German submarines in international waters, and Germany pretended it wasn’t happening. When Japan attacked the United States, Germany honored its pledge to Japan to go to war against the Americans if they did. I suspect the Germans would have much more content if Japan attacked the Soviet Union, or at least respected American neutrality and left Hawaii and the Philippines alone (focusing on Singapore, Indonesia, Australia and India). American public opinion was very anti-war, and few Americans saw anything worthwhile it going to war in order to rescue the British, French and Dutch Empires. While war between the United States and Germany was probably inevitable, it would have had a different outcome if it took place after the fall of Britain.
More importantly, we can see that the Japanese attack on Pearl Harbor had a great deal to do with “Haschaga pratis” since had the attack not taken place, it is unlikely that any European Jews would have survived. Those who were liberated in 1945, had little chance of being alive in the liberation was postponed by months, let alone years. And unless the US was at war with Germany, the US would not have been in a hurry to aid the Soviet Union, and especially if Japan did attack the Soviets, the outcome for Yidden on the Eastern Front would have been horrific.