There were a number of Jewish settlements in the West Bank and Gaza before 1948 on land that was legally purchased from the Ottoman era owners. Some of them were abandonned because they were on the wrong side of the partition. Others like Gush Etzion were taken by the Jordanian army after slaughtering the residents (like they also did in the old city of Jerusalem). Hebron also had more than 1000 years of having continuous Jewish residents until they were forced out by the Arabs under the British Mandate.I'm talking about the settlements built on land that Israel captured in the 1967 war. Are you saying they existed prior to that?
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That being said, the settlers are for the most part a set of kooks trying to impose their vision on the region. Even though I see there being some legal justification for some of those settlements, they are for the most part a roadblock to peace. The idea of land swaps in the plan under Clinton seem like a reasonable middle ground where significant Jewish settlements contiguous with the '67 border could be traded for a land route between Gaza and the West Bank.