Yemen in WWI

Before WWI Yemen was separated by three different groups; the far west coast was part of the Ottoman Empire, the whole southern coast was under British rule and the rest, about two thirds of it, was an independent state. However things changed after WWI was over. Because of the Sykes-Picot agreement Britain now had control over the whole country of Yemen, instead of just the southern coast.

Source:1) Dan Smith, The State of the Middle East: An Atlas of Conflict and Resolution (University of California Press Berkeley and Los Angeles, California, 2006, 2008), 20-27.