America chose not to enter the war because it felt that neither Japan or Hitlers Germany presented a large threat to America. This dose mean that the British, French, Dutch or any other country for that matter may very well not of been able to drag America into the war. However if numerous countries like the above mentioned ones met with constant loses that could very well bring the US into the war. They would of been fearful of two much success by any other country. They let Hitler role over Europe because were ever the German war machine when so also went destruction.
Although it controlled much of Europe the cost of this victory was that the infrastructure of each country was obliterated. This toll can been seen in the massive effort required after the war to rebuild Europe. In fact this may be part of the reason why Europe is ahead of North America in terms of pollution and fuel inefficiency. Although their has indisputably been a lot of political pressure witch has resulted in the high ranking, in term of efficiency and environmentalism, of Europe, much of the underlying infrastructure that these advancements depend on came into existence during the re-building of Europe after world war two.
Although this destruction meant that most of the countries were useless in terms of building up German's war machine it would eventually reach a point were German became powerful enough that although America was situated on a different continent America would see it as a treat and would therefore take measures to stop its growth and to diminish its power. The same would be true of Japan although it would be able to take over some foreign soil if successfully it would inevitably reach a point were America saw it as a potential threat. In their attack on pearl harbor they attempted to convince America that if they ever decided to fix its sights on Japan as an enemy the result would be devastating to American interests at home and abroad.
Although the attack on Pearl harbor only sped up the process the fact the it occurred at all shows the Japan saw that America would eventually enter the war.