Which kind of information does an author use to show that a topic has historical relevance?

To demonstrate that a topic has historical relevance, an author often employs quotes from historical figures. These quotes can provide insight into the thoughts, feelings, and beliefs of those who experienced the events firsthand, thereby contextualizing the topic within a broader historical framework. By using the words of influential individuals, the author adds authenticity and depth, establishing a connection between the topic and its significance in history. This approach not only illustrates the impact of the topic on past events but also helps readers understand its implications for the present and future.