The document discusses themes from Anthony Pagden's book "People's and Empires" about what defines successful empires and the pros and cons they involve. Successful empires require inventiveness, imagination, and individuality to rule over diverse peoples and cultures, widening their outlook, but this can also involve exploiting defenseless people, eliminating cultures, damaging resources, and oppression. Empires are defined by both their citizens and rulers, and as people change over time, so do the empires that govern them.