The Political Origins of Inequality: Why a More Equal World Is Better for Us All by Simon Reid-Henry, a lecturer in geography (both historical and political) at the University of London, is his accessibly-written political history and analysis, free for a limited time courtesy of the University of Chicago Press.
This is their featured Free Book of the Month for June.
This book covers the historical roots leading to present-day global issues with development and various forms of inequality—economic, social, authoritative, and otherwise—between various groups, and also contains an exhortation to greater individual political awareness and action.
Offered worldwide through June, available directly from the university’s website.