Hundreds of tribal leaders in this country signed a treaty negotiated by Harold and Doreen Ingrams in 1937. Part of this country was ruled by Imam Yahya until his assassination during the coup of the 
Hundreds of tribal leaders in this country signed a treaty negotiated by Harold and Doreen Ingrams in 1937. Part of this country was ruled by Imam Yahya until his assassination during the coup of the al-Wazir family. The Zaydi religious minority in this country was ravaged by civil wars between the PDRY and the YAR. After being wounded by a (*) bomb during the Arab Spring, Ali Abd Allah Salih ceded power in this nation, which is coming under the control of the Houthis. An American citizen named Anwar al-Awlaki was killed in this country. In 2000, 17 sailors were killed in a suicide bombing of the USS Cole in one of this country's harbors. For 10 points, name this Middle Eastern country that was once invaded by its northern neighbor, Saudi Arabia.