Answer: Historians use a variety of sources, including passenger lists, to understand and study history. Passenger lists can provide valuable information about the people who lived in a certain time and place, including their names, ages, occupations, and other personal details. This information can be used to learn more about the demographics of a particular population, the types of work that people did, and the conditions under which they lived. By analyzing passenger lists and other sources, historians can gain a better understanding of the social, economic, and cultural conditions of a particular time and place, and can use this information to draw conclusions about historical events and trends.