Jordan allowed Palestinian refugees to settle as Jordanian citizens but Palestinians were/are not welcomed by all other Arab nations and many kept them at border
Syria, Jordan and Egypt, provided support for PLO in six day war; but Syria and Egypt were more worried with their lost lands than refugees
Many Palestinians believed they had to fight for their homeland alone now; many in West Bank stayed after 1967, over 300,000 fled when it was captured by Israelis mostly to Jordan
From 1967 half of Jordan’s population (2mil) was Palestinian so Fatah concentrated forces in Jordan to recruit more volunteers