The Democratic Party is one of the two major contemporary political parties in the United States, along with the Republican Party. Tracing its heritage back to Thomas Jefferson and James Madison's Democratic-Republican Party, the modern-day Democratic Party was founded around 1828 by supporters of Andrew Jackson, making it the world's oldest active political party.
The Democrats' dominant worldview was once social conservatism and economic liberalism while populism was its leading characteristic in the rural South. In 1912, Theodore Roosevelt ran as a third-party candidate in the Progressive ("Bull Moose") Party, beginning a switch of political platforms between the Democratic and Republican Party over the coming decades, and leading to Woodrow Wilson being elected as the first fiscally progressive Democrat. Since Franklin D. Roosevelt and his New Deal coalition in the 1930s, the Democratic Party has also promoted a social liberal platform, supporting social justice.
Today, the House Democratic caucus is composed mostly of centrists and progressives, with a small minority of conservative Democrats. The party's philosophy of modern liberalism advocates social and economic equality, along with the welfare state. It seeks to provide government intervention and regulation in the economy. These interventions, such as the introduction of social programs, support for labor unions, affordable college tuitions, moves toward universal health care and equal opportunity, consumer protection and environmental protection form the core of the party's economic policy. The party has united with smaller liberal regional parties throughout the country, such as the Farmer–Labor Party in Minnesota and the Nonpartisan League in North Dakota.
Well into the 20th century, the party had conservative pro-business and Southern conservative-populist anti-business wings. The New Deal Coalition of 1932–1964 attracted strong support from voters of recent European extraction—many of whom were Catholics based in the cities. After Franklin D. Roosevelt's New Deal of the 1930s, the pro-business wing withered outside the South. After the racial turmoil of the 1960s, most Southern whites and many Northern Catholics moved into the Republican Party at the presidential level. The once-powerful labor union element became smaller and less supportive after the 1970s. White Evangelicals and Southerners became heavily Republican at the state and local level since the 1990s. People living in metropolitan areas, women, sexual minorities, millennials, college graduates, and racial and ethnic minorities in the United States, such as Jewish Americans, Hispanic Americans, Asian Americans, Arab Americans and African Americans, tend to support the Democratic Party much more than they support the rival Republican Party.
Fifteen Democrats have served as President under sixteen administrations: the first was seventh President Andrew Jackson, who served from 1829 to 1837; Grover Cleveland served two nonconsecutive terms from 1885 to 1889 and 1893 to 1897; and thus is counted twice (as the twenty-second and twenty-fourth President). The most recent was the forty-fourth President Barack Obama, who held the office from 2009 to 2017.
Following the 2018 midterm elections, the Democrats are the opposition party as of 2019, due to having the minority of seats in the Senate, as well as having the minority of governorships and state legislatures (full control of 17/50, split control of one other); However, they do have the majority in the House of Representatives, "trifectas" (the executive branch and both chambers of the legislative branch) in 14 states, and the mayoralty of numerous major American cities, such as Boston, Chicago, Los Angeles, Philadelphia, New York City, San Francisco, Seattle, and Washington, D.C. In the Supreme Court, four of the nine seats are filled by justices appointed by Democratic presidents.