Question: Who was an important leader of the Democratic-Republican Party?

<P0-S0>  It is set in an alternate history, the so-called Gallatin Universe, where a libertarian society has formed on the North American continent, styled the North American Confederacy ("NAC"). <P0-S1> The Probability Broach is the 1979 first novel by American science fiction writer L. Neil Smith. <P0-S2>  This history was created when the Declaration of Independence has the word "unanimous" added to the preamble, to read that governments "derive their just power from the "unanimous" consent of the governed". <SEP> <P1-S0> The Whig Party was a political party active in the middle of the 19th century in the United States. <P1-S1>  Four US presidents belonged to the party while in office. <P1-S2>  It emerged in the 1830s as the leading opponent of Jacksonians, pulling together former members of the National Republican (one of the successors of the Democratic-Republican Party) and Anti-Masonic Parties. <P1-S3>  It had distant links to the upscale traditions of the Federalist Party. <P1-S4>  Along with the rival Democratic Party, it was central to the Second Party System from the early 1840s to the mid-1860s. <P1-S5>  It originally formed in opposition to the policies of President Andrew Jackson (in office 1829–37) and his Democratic Party. <P1-S6>  In particular, the Whigs supported the supremacy of the US Congress over the Presidency and favored a program of modernization, banking, and economic protectionism to stimulate manufacturing. <P1-S7>  It appealed to entrepreneurs, planters, reformers and the emerging urban middle class, but had little appeal to farmers or unskilled workers. <P1-S8>  It included many active Protestants, and voiced a moralistic opposition to the Jacksonian Indian removal. <P1-S9>  Party founders chose the "Whig" name to echo the American Whigs of the 18th century who fought for independence. <P1-S10>  The underlying political philosophy of the American Whig Party was not directly related to the British Whig party. <P1-S11>  Historian Frank Towers has specified a deep ideological divide: <SEP> <P2-S0>  He was an important leader of the Democratic-Republican Party, serving in various federal elective and appointed positions across four decades. <P2-S1>  He represented Pennsylvania in the Senate and the House of Representatives before becoming the longest-tenured United States Secretary of the Treasury and serving as a high-ranking diplomat. <P2-S2> Abraham Alfonse Albert Gallatin (January 29, 1761 – August 12, 1849) was a Swiss-American politician, diplomat, ethnologist and linguist. <SEP> <P3-S0> The Democratic-Republican Party was an American political party formed by Thomas Jefferson and James Madison in 1791–93 to oppose the centralizing policies of the new Federalist Party run by Alexander Hamilton (1755/57-1804), who was secretary of the treasury and chief architect of George Washington's administration. <P3-S1>  The new party controlled the presidency and Congress, as well as most states, from 1801 to 1825, during the First Party System. <P3-S2>  It began in 1791 as one faction in Congress, and included many politicians who had been opposed to the new constitution. <P3-S3>  They called themselves "Republicans" after their ideology, Republicanism. <P3-S4>  They distrusted the Federalist commitment to republicanism. <P3-S5>  The party splintered in 1824 into the Jacksonian movement (which became the Democratic Party in 1828) and the short-lived National Republican Party (later succeeded by the Whig Party).