The Jews moving back to Palestine was already a matter of some concern in the earlier 20th century.
https://en.wikipedia.org/wiki/First_Aliyah
Please also go to the section'British Mandate in Palestine and read on from there. The post World War I period is where some of the seeds of the post world war II issues were sown. See also
From the end of the second world war, with the US and other western countries protecting Israel at the cost of Palestine and Jordan, it led to armed conflict with Israel and its neighbours Egypt and Jordan.
As I wrote earlier, the main reason that bin Laden and al Quaeda attacked US interests is that the US maintained bases on Saudi soil to protect Israel.
Again I remind everyone.....the terrorists of today are part of an intricate unbroken tapestry of conflict. They did not just appear out of nowhere. But it does no good for westerners to get all defensive and try to confuse the reasons why things happen with blame. I could, if I had the time set out the unbroken chain of militant movements and terrorism in the middle east from the end of World War I to last week in France. At this point, it hardly matters what role France, England, the US, Russia(USSR) and a host of other minor western nations have played in events that have led to November 2015...suffice it to say that as we speak, a number of countries are continuing to bomb parts of Syria to desolation and I suspect that it will now raise the stakes considerably as to the type and severity of terrorist reprisal attacks that can be expected throughout Europe and North America.
But war is hell. And this is the type of war that we've all signed up for in an age where all countries are averse to becoming mired in another ground war like Bush created in Iraq.