The war in Yemen has now proven to be a key trigger for the reduction of the US’ 70-year strategic dominance of the Persian Gulf and Arabian Peninsula. This is despite the fact that the US had only minor involvement in, or control over, the war prosecuted under Saudi Arabian leadership against Yemeni Houthi forces. The full history has yet to be written, but Saudi Arabia’s de facto recognition of its defeat in Yemen — Riyadh cannot formally admit defeat because of the domestic and regional consequences of that act — is one…