What was one effect of the Balfour declaration?

The Balfour declaration issued in 1917, is considered as a principal cause of the ongoing Israeli - Palestinian conflict which posed a major threat to the world peace even today.

Explanation:

Balfour Declaration was a public statement issued by the British Government in 1917 during the First World War announcing support for the establishment of a "national home for the Jewish people" in Palestine then an Ottoman region with a small minority Jewish population and that nothing shall be done which may prejudice the civil and religious rights of existing non - Jewish communities in Palestine, or the rights and political status enjoyed by Jews in any other country".

Contained four clauses:

First two promised to support "the establishment in Palestine, a national home for the Jews"

Two "safeguard clauses"

With respect to "the civil and religious rights of existing non - Jewish communities in Palestine" and "the rights and political status enjoyed by Jews in any other country"

It was the first time in an official record of the British that enlisting the support of Jews as a war measure had been proposed.

This Declararation was written by Arthur Balfour, United Kingdom's Foreign Secretary to Lord Rothschild, a leader of the British Jewish community in 1917.

Effect:

It greatly increased popular support for Zionism (nationalist movement of the Jewish people that espouses a Jewish state in Israel) within Jewish communities worldwide, and became a core component of the British Mandate for Palestine, which later became Israel and the Palestinian territories, as a result, it is considered as a principal cause of a major struggle between the Jewish and the Arab enmity disturbing the world peace.