James Madison was the fourth President of the United States, serving from 1809 to 1817. He is often referred to as the "Father of the Constitution" for his role in drafting and promoting the document. Madison was a key figure in the early years of the United States, playing a leading role in shaping the country's government and policies. He is known for his strong belief in individual liberties and limited government, and his presidency saw the country expand its territory through the Louisiana Purchase and the acquisition of Florida. Despite facing challenges such as the War of 1812, Madison is remembered as a strong and effective leader who helped to establish the United States as a major world power.