What are the important people or events that molded Ulysses S. Grant?

Ulysses S. Grant was significantly shaped by key figures and events throughout his life. His military career was influenced by his experiences in the Mexican-American War, where he honed his leadership skills. The mentorship of figures like General Henry Halleck and his later partnership with President Abraham Lincoln played pivotal roles in his strategic development during the Civil War. Additionally, Grant's personal struggles with alcohol and his resilience in overcoming them contributed to his character as a determined leader.