Yemen’s civil war reignited in early October, as Saudi Arabia brought in Turkish and Pakistani military support to fight the Houthi rebels, who have governed much of northern Yemen as a de facto authority and waged a guerrilla war in the country since...

Empires historically possessed a unique ability to organize diversity and successfully rule over people quite different from one another. The national states that succeeded them in Europe were organized on the basis of nationality (real or imagined) where diversity in language, ethnicity, or religion was...