Your question suggest that you do not understand Zionism or the relationship between Israels and Palestinians. Zionism is a movement that began in 1897 and was founded by Theodore Herzl. The idea was (and is) that Jewish people should have an entitlement to the country of their ethnic and religions roots, which was bibilically and historically Israel and a nation called Judea. Unfortunately, Jewish people were forced out of these areas by various conquoring nations, and dispursed all over the world, where they managed to hang on to their religion and culture.
After World War II, when the world became aware that 6 million Jews had been slaughtered, world leaders finally agreed to establish a Jewish homeland. Unfortunely, that homeland, while it had some Jewish people, was mostly populated with Palestinians. Many Palestinians did not want to stay and build a Jewish state, and things have gone downhill ever since. Palestinians feel they have been displaced, and Israelis feel that they have returned to their homeland.
So the question is not what caused Zionism between the Israelis and Palestinians. The question is really what were teh consequences of Zionism in the country we now call Israel. This is an incredibly complicated question, and entire books have been written about it. So all I have really provided is a general overview, and I hope a fairly balanced one. If you do additional research, particularly on the Internet, you will find that most web sites promote either the Israeli or the Palestinian point of view, and that it is difficult to find a "neutral" source on-line. It might be best to about both points of view and come to your own conclusions.
Good luck to you.