Just look up the history of Israel before it was given statehood and of Zionism. Here is a good article by the Guardian. warning, it's a very complicated situation, all in all, and this article really gets into the nitty gritty of history. Literally, deep into it. It's some heavy reading.

Boiled down though...

After the defeat of the Ottomans and their empire partitioned off to various countries after the Sinai and Palestine campaigns of WW1, the British were given control via a mandate by the League of Nations over a territory that became known as the Mandate of Palestine, but it was still mostly Arab citizens, the British were just given authority to maintain order in the region.

During the years of occupation, the British government encouraged European Jews to settle the region in an effort to fulfill political obligations to the Zionist movement made at what is known as the Balfour Declaration. This caused a civil war to break out over the whole colonization thing.

With the end of the Mandate over the region drawing to an end, and the tensions of the area heightened after civil war, the U.N. voted to subdivide the Mandate of Palestine into two separate states: Palestine and Israel

Here's the long version.

Short version is that in WW1, the UK conquered Palestine from the Ottoman empire. 1922-1948, the British ran the territory, getting shot at regularly by both native Arabs, the tiny number of native Jews, and the comparatively much larger group of immigrant Jews. In the 1940s, the UK asked for and got US help with counterterrorist operations, especially against Jewish ones. Arabs and Jews pinky promised to play nice with each other if the UK left, so rather than continue getting shot by everyone in the region, they left. Arabs and Jews immediately started a war as soon as the UK army left. Then, every single neighbouring country attacked the newly formed Israel, which they somehow survived.

(Missing HUGE amounts of context and nuance here, obviously)

Sing along

Yea, they say they restricted the Jewish immigrants. Yet, if you read the article posted in my other comment, you'd see that their actions during the time period of their mandate speaks a different tale.

Them abstaining from the vote is purely performative, and doesn't negate the rest of what they did to facilitate the colonization of Palestine.

The british should have stopped the zionist army after the zionists terrorist act against their personels ftom creating the terrorist state