CoDominium, which essentially was the capitalist North Americans with the Socialistic (presumably) Second Soviet Union, or possibly the PRC if retconned, and minimal representation from everyone else.
The CoDo as a whole was strongly socialist... but with a capitalist mean streak in the elites, especially the politicians, in both component nations, and political disenfranchisement of the recipients of welfare benefits. Eventually leading to forced exporting of the impoverished but healthy to offworld colonies...
Later novels make it clear that it's indeed the second Sovietski Soyuz Socialisti Republiki...