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Their are Constitutional Republics (The US is one) and Monarchy Republics (The UK is one).
They were independent republics.
Central Asian Republics:
Kazakhstan Kyrgyzstan Tajikistan Turkmenistan Uzbekistan
the transcuacasian republics:
Armenia Azerbaijan Georgia
The Union of Soviet Socialist Republics
The Transcaucasian republics consist of Armenia, Azerbaijan, and Georgia. The Central Asian republics include Kazakhstan, Kyrgyzstan, Tajikistan, Turkmenistan, and Uzbekistan.