Who was the fourth president of the United States?

James Madison Jr. (March 16, 1751 – June 28, 1836) was an American statesman, diplomat, and Founding Father who served as the 4th president of the United States from 1809 to 1817. He is hailed as the "Father of the Constitution" for his pivotal role in drafting and promoting the Constitution of the United States and the Bill of Rights.

Born into a prominent Virginia planter family, Madison served as a member of the Virginia House of Delegates and the Continental Congress during and after the American Revolutionary War. Disillusioned by the weak national government established by the Articles of Confederation, he helped organize the Constitutional Convention, which produced a new constitution. Madison's Virginia Plan served as the basis for the Constitutional Convention's deliberations, and he was one of the most influential individuals at the convention. He became one of the leaders in the movement to ratify the Constitution.

Madison won the 1808 presidential election. After diplomatic protests and a trade embargo failed to end British seizures of American shipping, he led the United States into the War of 1812. The war was an administrative morass and ended inconclusively, but many Americans saw it as a successful "second war of independence" against Britain. As the war progressed, Madison was re-elected in 1812, albeit by a smaller margin than the 1808 election.