One important event was his birth in 1831. Another was his entry into politics. His service in the Civil War was crucial. And of course, his becoming president in 1881 was a major event, followed shortly by his assassination.
Well, starting with his birth, it set the stage for his future. His struggle for education was important as it led to his political rise. His role in the Civil War was not only about fighting but also about leadership. When he became president, it was a new chapter. However, his assassination in 1881 overshadowed all else and became a turning point in American history related to his life.