Kazakhstan, Uzbekistan, and Tajikistan were once part of what nation?

Here is the question :

KAZAKHSTAN, UZBEKISTAN, AND TAJIKISTAN WERE ONCE PART OF WHAT NATION?

Here is the option for the question :

• U.S.S.R.
• Yugoslavia
• Prussia
• Czechoslovakia

The Answer:

And, the answer for the the question is :

Explanation:

[STC0018044]. The Tajik Soviet Socialist Republic joined the Soviet Union in 1929, the Turkmen and Uzbek Soviet Socialist Republics in 1925, the Kirghiz (later known as Kyrgyzstan) and Kazakh SSRs in 1936. Following the collapse of the Soviet Union in 1991, Kazakhstan, Uzbekistan, Tajikistan, Kyrgyzstan, and Turkmenistan all gained independence.