what was formed after world war 2 in order to provide a safe heaven from the effects of the jewish holocaust

the united nations UN

The State of Israel

Explanation:

In 1917, Britain issued the "Balfour Declaration," which declared its intent to establish a Jewish homeland in Palestine. Although protested by the Arab states, the Balfour Declaration was included in the British mandate over Palestine, which was authorized by the League of Nations in 1922.