i chosed או i chosen?

I chosed Adolf Hitler because he is the most known leader in all history,he started one of the biggest wars that humanity has ever known. he was very powerful and many people followed him with closed eyes.With his power he made people do what he wanted, even things no one would ever have imagined.

יש לי עבודה באנגלית ואני צריכה להסביר למה בחרתי במנהיג שבחרתי (היטלר). אם יש לכם עוד תיקונים אשמח לשמוע