Doesn't change the fact that they collaborated with the British against the Caliph, a treasonous offense.

you either mistaken them from the sharifats, or maybe you are out right retard, even the sharifats contribution to the war effort against the ottoman was, which is considered by historian, pretty insignificant comparing to that of britin

Please take your retardedness elsewhere, history exists for a reason

the agreement, was after the decline of the ottoman empire.

The agreement was in 1915, I'm not sure about what they teach you people but the ottoman empire didn't collapse until 1922 The house of Saud directly contributed to the fall of the last Caliph

i am the one who should ask you what they teach you in school, yes the house of othman declined in 1922, but the empire lost control of iraq, meccah, and the levant way before that, dumbass, and the treaty was about recognition of the saudi state by britain

The Saudi state didn't exist in 1915, the treaty contained a clause that guaranteed the house of Saud would fight against the ottomans, the ottomans lost control of mecca only a year after said treaty, facts are very very stubborn