Democratic Party - United States - was created in 1828.

"Both major political parties in the United States select their presidential candidates through a process of primary elections. However, voters do not directly select presidential nominees in these primaries. Instead, they choose delegates from their respective states who will attend a national party convention to nominate a presidential candidate for their party." from thisnation.com

United Christian Democratic Party was created in 2004.

Social Democratic Party - United States - ended in 1901.

Social Democratic Party - United States - was created on 1898-06-11.