Historical emphasis
First of all, you should grasp the key points of history, such as time, people, events (understanding the background of events), significance (influence or function) and so on.
Movies and TV plays
Then, you can find some movies or TV series about people or things in this historical event on the Internet (it is better to find some paper materials, such as novels and biographies, but that will take more time) and dissolve your understanding into these materials.
Discussion circle
Bring your understanding into a circle of discussion and show your talents. This is also one of the best ways to cultivate interest.
High test scores
Finally, getting high marks on your own test paper, seeing the envious eyes of others and enjoying the joy of success is a way to cultivate interest.