51st state:

This position was carried by the D.C. Statehood Party, a political party; it has since merged with the local Green Party affiliate to form the D.C. Statehood Green Party. The nearest this movement ever came to success was in 1978, when Congress passed the District of Columbia Voting Rights Amendment. Two years later in 1980, local citizens passed an initiative calling for a constitutional convention for a new state. In 1982, voters ratified the constitution of the state, which was to be called New Columbia. The drive for statehood stalled in 1985, however, when the Washington, D.C. Voting Rights Amendment failed because not enough states ratified the amendment within the seven-year span specified.

Please answer a question about this article. If the question is unanswerable, say "unanswerable". What party did the Washington Party merge with?
unanswerable