Mostly they hoped to take out the US naval fleet and have their way in the pacific while Germany kept the allies busy, and then eventually win in Europe creating a world wide axis.
Germany and Japan correctly feared the United States long before its entry into the conflict. They feared it not necessarily as a war machine, but as a relentless and massive industrial machine. They knew that, if war with the US were to drag on for a few years, the US would eventually get its shit together and outproduce and outgun either of them by an order of magnitude.
I don't claim any authority, but it's important not to project our own views of cultural permanence onto other cultures. Japan has businesses that have spanned over a 1000 years contiguously. I would not be surprised if Japan had a view that spanned much further into the past (particularly during the days of the Emperor).
Oh, just another side. Those are only a couple of examples of Western aggression in the previous century. Europe and the U.S. had been quite active in South East Asia. There likely would have been Japanese alive at the time who had a living memory of events like the colonization of Vietnam.
But, my point is that even conceding such a long view of history, the US probably didn't look more menacing than Europe. The US was a minor political and economic power, whereas Europe was much more powerful and had its own much longer history of imperialism and territorial expansion by divine right.
The implication seems like a bit of historical revisionism in hindsight, based on how threatening the US seems to a lot of people now.
I agree with you that the US was under-powered militarily at the time, but by the 40s the US had been the world's largest economy and industrial power for decades.
edit
Though I've read papers that also trace a shortening of the window of timeliness to the appearance of public clocks. Like Big Ben.
That may be true in London, for all I know, but it's definitely not true in western culture as a whole.
There are different times for when you can actually do anything about it - mostly if a train is delayed by an hour you can get a refund (if you chose not to travel) or compensation (if you were already travelling before the delay happened), but it's a bit complicated.
For London tube trains you can get some refunds if the train is 15 minutes late.
http://www.theguardian.com/money/2012/dec/18/how-claim-train...
> Transport for London (TFL) offers refunds if a passenger's journey is delayed by more than 15 minutes. For tube passengers, this amounts to the fare for the single journey you were making, whether you have a season ticket, or have purchased a single fare. London Overground users get the same, but only when their train is delayed by more than 30 minutes