Dick Cheney, widely regarded as the most powerful vice president in modern U.S. history, died Monday at 84 from complications of pneumonia, along with cardiac and vascular disease, according to his family. A dominant force in American politics during the post-9/11 era , Cheney helped steer two wars, expanded executive power, and left behind a legacy as polarizing as it was influential. His health battles were nearly as well-known as his political career: five heart attacks, a defibrillator, and