Answer
The primary focus of Tacitus' "De vita et moribus Iulii Agricolae" revolves around the conquest and governance of Britannia (modern-day Britain) under the Roman Empire. The emphasis lies on the career and accomplishments of Gnaeus Julius Agricola, a distinguished Roman general and Governor of Britannia. Agricola's military endeavors led to the expansion of Roman control, but he also emphasized peaceful assimilation and promoted education and advancement among the indigenous people.