As for the rest of your comment - I don't understand. Please explain.
http://en.wikipedia.org/wiki/British_Mandate_for_Palestine
The British Mandate for Palestine, also known as the Palestine Mandate and the British Mandate of Palestine, was a legal instrument for the administration of Palestine, the draft of which was formally confirmed by the League of Nations on 24 July 1922 and which came into effect on 26 September 1923.[1] The document was based on the principles contained in Article 22 of the draft Covenant of the League of Nations and the San Remo Resolution of 25 April 1920 by the principal Allied and associated powers after the First World War.[1]
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The preamble of the mandate declared:
Whereas the Principal Allied Powers have also agreed that the Mandatory should be responsible for putting into effect the declaration originally made on November 2nd, 1917, by the Government of His Britannic Majesty, and adopted by the said Powers, in favour of the establishment in Palestine of a national home for the Jewish people, it being clearly understood that nothing should be done which might 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.[3]
The San Remo[1] Conference was an international meeting of the post-World War I Allied Supreme Council, held in Sanremo, Italy, from 19 to 26 April 1920. It was attended by the four Principal Allied Powers of World War I who were represented by the prime ministers of Britain (David Lloyd George), France (Alexandre Millerand) and Italy (Francesco Nitti) and by Japan’s Ambassador K. Matsui.
It was agreed –
The High Contracting Parties agree to entrust, by application of the provisions of Article 22, the administration of Palestine, within such boundaries as may be determined by the Principal Allied Powers, to a Mandatory, to be selected by the said Powers. The Mandatory will be responsible for putting into effect the declaration originally made on November 8, 1917, by the British Government, and adopted by the other Allied Powers, in favour of the establishment in Palestine of a national home for the Jewish people, it being clearly understood 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.
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The International community gave Britain the Mandate under a pledge to fulfill the Balfour Declaration. When they failed to do so, when in fact they did everything in their power to stifle Jewish aspirations, the British presence in the Land of Israel became illegal in and of itself.
That illegal behavior by Britain is what the Jewish underground fought against.