You should say:
Who he/she is
what he/she did
When you first knew him or her
and why you are interested in him/her
雅思口语part2高分话题范文参考：历史人物(Describe a historical person that you are interested )
The United States of America is a land of historical events. Besides, the country is also famous for some of its heroic sons. Abraham Lincoln is one of them. I am really glad that I got the opportunity to talk about him for the next few minutes.
I knew about Lincoln from the history class when I was in high school . Abraham Lincoln was the 16th President of the USA. During his reign, the situations were unusual. The country went under some serious critical moments and the Civil War was one of them. Besides, there were some political and constitutional crises as well. But Lincoln controlled the situations in an efficient manner. It is Abraham Lincoln who abolished the slavery. Before the abolition of this system, racism was at its peak. Lincoln also did some other notable activities. He is the man who also made the federal government system stronger. The modern economy actually started its journey with the association of this President. In fact, many of the facilities we are enjoying today are the gift of this smart man.
Yes, I like him much. He is a historical figure in the history of the USA. He served the country as a great guardian and wanted to improve the existing norms and rules. Accordingly, a good number of changes took place in the country and we are bearing the legacy in the present days. It is really a matter of courage indeed to rule a nation during a bloody war and provide the right directives, working amid internal crisis and more. He also supervised and set strategies during the war so that the losses are minimal. All of his attempts were humane and he dreamt of a modern America. He emancipated the slavery in the Thirteenth Amendment to the Constitution for the USA. In fact, this the greatest tasks he has ever done and for this reason, a majority of the US citizens like me hail him.