the british had already decided to create "a national home for the jewish people" in palestine midway through wwi though, it's not as if they up and decided to hand over a bunch of land to the kikes just because the germans interned them. and in its modern form, which is to say radically zionist, it has existed since 1921 when the american zionists took control of the jewish community living in palestine through threats and coercion.
United States