The Democratic Party is the longest-existing political party in the US, and arguably the world. Watch the remarkable ideological and geographic transformation that has taken place over its 180-year history:

Originally a staunch defender of Southern slavery, the party now wins the support of most nonwhite voters. Once an advocate of rural interests against coastal elites, it now draws much of its strength from cities and coastal areas.

To dive deeper into the history of the party, check out the 23 maps that explain how Democrats went from the party of racism to the party of Obama.