. . . With growing unrest at home over the loss of Soviet soldiers in Afghanistan and the inability of the society to wage a foreign war and provide the essentials of life to its own citizens, the USSR was forced to retreat in ignominious [humiliating] defeat in February 1989— fewer than ten years after its invasion. This proved to be the final straw on the Soviet camel's back. By the end of the same year, the Berlin Wall was down, and the Warsaw Pact was dead. Within two years, the Soviet Union was history. . . .Based on this passage, what long term impact did the invasion of Afghanistan have on the Soviet Union

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