Inglorius Empire by Shashi Tharoor. You can make an arguement either way. Indentured servant or slave. Maybe India wouldn't be what it is today without British rule. I would contrast it with how Italy occupied Somalia. I bet it would be a more prosperous place if they had been there longer. The same with Libya. Italy has paid reperations to Libya for almost 100 years for occupying Libya. One can argue that too would be in better shape today if Italians had more time there.