It is not clear what you mean, how the Palestinians got into the West Bank? But it is clear you don't know how the Palestinians got there. Their ancestors were in Canaan before the Israelites arrived from across the Jordan river. It is amazing, you Jews have occupied Palestinian land for 42 years and know nothing about them nor where they come from. When Israelites crossed from Jordan into Canaan, known as Palestine, the land was occupied by (among others) the semite tribes, Amorites, Hittites and Jebusites. The Jebusites had built Jerusalem and inhabited the city for 100 more years Many noted scholars and historians have determined that the Jebusites are the forebears of Palestinians. The NYU School of Medicine and the Academy of Science discovered that ME Jewish men have a common genetic signature with Lebanese men, Syrian men and Palestinians, and with no other non-Jews in the world.
Hamas calls for 'day of rage' at Temple Mount, Al-Aqsa in wake of deadly West Bank murder (Haaretz)
from the article: Jordan condemns Israel over West Bank deportation order