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The Samaritans were very numerous in the days when Jesus preached the Gospel, as he passed through Samaria from Galilee to Judea, as did all Galileans when travelling to Jerusalem.
In the days of the Byzantine empire, there were three great Samaritan uprisings for independence, but the Byzantine army put these revolts down with massive display of arms, similar to when the Romans put down the Jewish revolts of 66-70 AD and 135 AD.
Later, the Samaritans suffered severely under the rule of various Muslim leaders.
The Palestinians do not descend from the Philistines, but mainly from Egyptians - and also from people from other neighbouring areas - who settled in Palestine from the 1800's onwards.
The Jews did not go to Israel in order to displace anyone, but to settle there on non-private land. You may find that a war in 1948 caused many Palestinians to be displaced, because the governments of neighbouring Arab countries who invaded Israel informed the Palestinians to leave their homes, with the intention of them returning once Israel had been connquered, which never came about.
The Palestinians who did not follow this advice and remained, were never displaced by the Jews, as you may find out if you read a few history books. Presently there are over a million Palestinians living in the state of Israel, as Israeli citizens, and about 2 million living in the West Bank, plus those in Gaza.