Answer: James Madison
During the early 1790s, Madison opposed the economic program and the accompanying centralization of power favoured by Secretary of the Treasury Hamilton. Alongside Thomas Jefferson, he organized the Democratic–Republican Party in opposition to Hamilton's Federalist Party. After Jefferson was elected president in 1800, Madison served as his Secretary of State from 1801 to 1809. While Madison was Secretary of State, Jefferson made the Louisiana Purchase, and later, as President, Madison oversaw related disputes in the Northwest territories. Madison was elected president in 1808. Motivated by the desire for acquiring land held by Britain, Spain, and Native Americans, and after diplomatic protests with a trade embargo failed to end British seizures of American shipped goods, 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. Madison was re-elected in 1812, albeit by a smaller margin. The war convinced Madison of the necessity of a stronger federal government. He presided over the creation of the Second Bank of the United States and the enactment of the protective Tariff of 1816. By treaty or through war, Native American tribes ceded 26,000,000 acres (11,000,000 ha) of land to the United States under Madison's presidency.
Retiring from public office at the end of his presidency in 1817, Madison returned to his plantation, Montpelier, and died there in 1836. Like Jefferson and Washington, Madison was a wealthy slave owner who favoured republican government over the democratic assembly. Forced to pay debts, he never freed his slaves. Among historians and in polls of leading historians, Madison is considered one of the most important Founding Fathers of the United States, and these historians have generally ranked him as an above-average president, although they are critical of how Madison executed the War of 1812. Madison's name is commemorated in many landmarks across the nation, both publicly and privately, with prominent examples including Madison Square Garden, James Madison University, and the USS James Madison.