On 1948, some evil Arabs had some evil plans.
Those evil Arabs lost and third party Palestinians fearing Jewish revenge fled their homesteads, becoming refugees.
The victorious Jews whom the evil Arabs intended to slaughter soon realized things were better and safer with the Palestinians gone, so most third party Palestinians were not allowed back or offered acceptable compensation for their abandoned homesteads.
In 1945, a mere three years earlier than 1948, Germany and Germans lost about half of eastern Germany.
The Ottoman Empire lost all of Palestine in WWI.
Right on.
The refugee movements for 5-10 years after the end of WWII in 1945 dwarfed what happened to a relative few Arabs in Palestine/Israel. Somehow that all got sorted out one way or another, except for the “Palestinians”, who are still refugees from that era 75 years later. Because they were useful tools for the Muslims neighbors of Israel who want to clear out the Jews “from the river to the sea.”