The Democratic Party has its origin in the Democratic-Republican Party founded by Thomas Jefferson and James Madison in the 1790s. It is the oldest political party in the United States, and has been the nation's main center-left political party since the 19th century. Throughout its history, the Democratic Party has held a position of traditional liberalism, promoting social and economic reform while championing the rights of the marginalized. In the modern era, the party has supported labor unions, civil rights, environmental protection, and social programs including the Affordable Care Act.
Summarize the history of the US Democratic Party