scott, are you basing your knowledge of Jewish occupation of the land solely on Old Testament accounts? This is important to know because that will help us understand your point of view and how best to address you.
Either way, how far back should one go? Abraham? Joshua? Abraham, as Genesis tells us, lived peacefully with the people who preceded him there. Only upon the death of Sarah did he purchase any land, a field in which his wife was buried. Joshua of course came in and – according to scripture – destroyed at least some towns of the original inhabitants. However, the original inhabitants were never totally driven out, and archeological evidence does not show that they ever left completely. I would like to know what your sources are. Thanks.