James Knox Polk has the distinction of not only being the 11th President of the United States of America but also being the youngest among all who had graced this prestigious post till that time. Today, he is remembered as a man of unblemished character, who as per his word retired after serving a single presidential term, whereas if he wished, he could have easily won the reelection as popular sentiment was with him. He was responsible for exponentially extending the territories of America, in fact, he added around a million square miles to it. The regions James K. Polk brought under the union included Arizona, Utah, Nevada, California, Oregon, Idaho, Washington, a large part of New Mexico, and areas of Wyoming, Montana, and Colorado. He was a firm believer in the concept of "Manifest Destiny," as per which, it was thought that it was the United States preordained right to establish its republican ideology and system across the continent of North America. James K. Polk managed to achieve all the aims and objectives that he had set for himself before taking up the presidency. Read his biography to know more about this extraordinary statesman and leader.