Why did many western European countries support Israel in establishing their own country

Historical circumstances caused the arrival of a large number of Jews on the territory of today's Israel.

Explanation:

This intensified, especially during the Second World War. Since many countries in the world "closed the door" to the Jews, they migrated en masse to the territory of today's Israel. At the end of the war, they were the majority of people in the region, so the United Nations had no choice but to form a new state. Some historians believe that this was a kind of "compromise" of international political bodies due to the mass suffering of Jews in the Second World War.

a memoir is the correct answer