The Soviet Union fell because people rebelled against communism and totalitarianism.
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The Kingdom of Axum was an important region in the Silk Road, because they had their own currency, which facilitated trade in the Silk Road trade and although it was sovereign, it sometimes entered the politics of the Arabian Peninsula, so it is safe to say that it was known and had good relations with it's neighbors and the people coming in and the people going out. Slowly afterwards, they started expanding their rule over the Arabian Peninsula.
Kievan Russia traded with the Byzantines extensively. It was a loose federation of East Slavic tribes in Europe, under the reign of the Rurik dynasty. Currently, the modern peoples of Belarus, Ukraine and Russia all claim Kievan Russia as their cultural ancestors.
A the space race or c the entry of women into the work force during world war ll