Differentiated book- It has a historical context with research of the time-Personal Memoirs of Ulysses S. Grant by Ulysses S. Grant.This book contains a historical context, where past events or the study and narration of these events are examined. The historical context refers to the circumstances and incidents surrounding an event. This context is formed by everything that, in some way, influences the event when it happens. A fact is always tied to its time: that is, to its time. Therefore, when analyzing events that took place tens, hundreds or thousands of years ago, it is essential to know the historical context to understand them. Otherwise, we would be analyzing and judging what happened in a totally different era with a current perspective.It is an autobiography of Ulysses S. Grant, the 18th President of the United States, focused primarily on his military career during the Mexican-American War and the American Civil War, and completed when he was dying. throat cancer in 1885. The two-volume set was published by Mark Twain shortly after Grant's death.Twain created a unique marketing system designed to reach millions of veterans with patriotic appeal just as Grant's death was mourned. Ten thousand agents traveled the North, following a script that Twain had devised; many were veterans wearing their old uniforms. They sold 350,000 two-volume sets at prices of $ 3.50 to $ 12, depending on the binding (approximately $ 100 to $ 340 in 2019).