Remember the majority of Jews in present day Israel, to the tune of 70% if I am right, come from the middle east and north Africa. These Jews historically lived under majority Muslim rule and were safe. It was only the Ashkenazi Jews from Europe who were slaughtered and massacred. That is an important distinction to make and understand. After Israel's formation, many in North Africa and the Middle East may have encountered discrimination, as backlash, but the massacring was primarily in Europe. Also, even before the formation of Israel, remember that Jews formed paramilitary groups like the Haganah, Irgun, Lehi etc., who themselves were engaged in massacring Arabs. Check this for instance:
en.wikipedia.org
Now, Arabs also did it. For example:
en.wikipedia.org
So, it is not important to look at anything prior to 1948. It was filled with blood shed, perpetrated by both sides. It is only after Israel was victorious in the 1948 war, that they started to take territory, and people were displaced and the current accusation of oppression of the Palestinians started.