Can you name every country that was once run as a Marxist-Leninist state?
Some nations no longer exist. The republics of the Soviet Union have been included.
The dates for Vietnam don't seem right to me. If N Vietnam was communist 1945-1976, after which it joined with S Vietnam and remained communist, then surely the dates for "Vietnam" should be 1976-Present? S Vietnam was hardly communist before that. Also, you included, some Soviet Union states but excluded most of them. No explanation of how the three were chosen.