Jefferson was the primary author of the Declaration of Independence.
He is an icon of individual liberty, democracy, and republicanism, hailed as the author of the Declaration of Independence, an architect of the American Revolution, and a renaissance man who promoted science and scholarship. The participatory democracy and expanded suffrage he championed defined his era and became a standard for later generations.[380] Meacham opined, that Jefferson was the most influential figure of the democratic republic in its first half century, succeeded by presidential adherents James Madison, James Monroe, Andrew Jackson, and Martin Van Buren. Jefferson is recognized for having written more than 18,000 letters of political and philosophical substance during his life, which Francis D. Cogliano describes as "a documentary legacy ... unprecedented in American history in its size and breadth." Jefferson's reputation declined during the American Civil War, due to his support of states' rights. In the late 19th century, his legacy was widely criticized; conservatives felt that his democratic philosophy had led to that era's populist movement, while Progressives sought a more activist federal government than Jefferson's philosophy allowed. Both groups saw Alexander Hamiltonas vindicated by history, rather than Jefferson, and President Woodrow Wilson even described Jefferson as "though a great man, not a great American".