That's a bit of a loaded question, because it depends on how you consider the British role in the dissolution of the Ottoman Empire at the end of World War I.  Prior to that war, the Ottoman Empire had evolved over several hundred years, at times encompassing most of southeastern Europe (Romania, Bulgaria, the states formerly composing Yugoslavia), modern Turkey, Iraq, Jordan, all of the Arabian Peninsula, Eqypt, and much of northern Africa.   at the end of the World War I, the Empire was broken up, and most of the administration and nation-building in the area was performed by the British.   While Iran, Saudi Arabia, and Jordan were created based on regional figures of authority (the Shah, the Saudi royal family, and the Hussein royal family (no relation to Saddam)) the other nations had borders drawn largely for convenience.  Some good books are the subject are linked below.
Is Iraq an artifical country?