The 1991 collapse of the Communist regime in the country in another country, Mongolia. Cambodia and South Yemen United the rest of the country, the world's superpower.
Since 1991, the collapse of the communist regime in countries like Mongolia. Cambodia and South Yemen The US remains the world's sole superpower country.
(1991 collapse of the Communist regime in a country like Mongolia, Cambodia and South Yemen. The United States is a superpower of the world's countries alone.