Declaration of Independence. He first opposed patents and later supported them. In 1790–1793, as Secretary of State, he was the ex officio head of the three-person patent review board (the Secretary of War and the Attorney General being the other two patent reviewers). He drafted reforms of US patent law which lead to him being relieved of this duty in 1793, and also drastically changed the patent system. As Minister to France, Jefferson was impressed by the military standardization program known as the Système Gribeauval, and initiated a program as president to develop interchangeable parts for firearms. For his inventiveness and ingenuity, he received several honorary Doctor of Law degrees. Legacy Historical reputation Jefferson 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. 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 Hamilton as vindicated by history, rather than Jefferson, and President Woodrow Wilson even described Jefferson as "though a great man, not a great American". In the 1930s, Jefferson was held in higher esteem; President Franklin D. Roosevelt (1933–1945) and New Deal Democrats celebrated his struggles for "the common man" and reclaimed him as their party's founder. Jefferson became a symbol of American democracy in the incipient Cold War, and the 1940s and 1950s saw the zenith of his popular reputation. Following the civil rights movement of the 1950s and 1960s, Jefferson's slaveholding came under new scrutiny, particularly after DNA testing in the late 1990s supported allegations that he had fathered multiple children with