In a world ruled by kings and emperors, the United States of America was a risky experiment a republic of, by, and for the people with power divided among three branches of government. But it is one branch, the Executive, in which the hopes and aspirations of the American people are primarily embodied - in the President of the United States. In the week preceding the 2013 Presidential inauguration, HISTORY will present "THE ULTIMATE GUIDE TO THE PRESIDENTS". From George Washington to Barack Obama, this eight-hour series will cover the history of the most influential position in the world, and the men who defined its power. The series premieres on Tuesday, January 15 at 9 pm ET on HISTORY. Forty-three men have taken the oath of President of the United States. Whether each set groundbreaking precedent, declared war or enacted laws altering the destiny of millions, each found himself in the eye of the storm. "THE ULTIMATE GUIDE TO THE PRESIDENTS" delves inside the inner-workings of the Presidency, as well as the minds, methods and motivations of each man who has held the position of Commander-In-Chief. (Source: The History Channel)