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The collapse of the Berlin Wall was the culminating point of the revolutionary changes sweeping East Central Europe in 1989. Throughout the Soviet bloc, reformers assumed power and ended over 40 years of dictatorial Communist rule. The reform movement that ended communism in East Central Europe began in Poland
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For almost 30 centuries—from its unification around 3100 B.C. to its conquest by Alexander the Great in 332 B.C.—ancient Egypt was the preeminent civilization in the Mediterranean world.
The success of ancient Egyptian civilization came partly from its ability to adapt to the conditions of the Nile River valley for agriculture. The predictable flooding and controlled irrigation of the fertile valley produced surplus crops, which supported a more dense population, and social development and culture.
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The Concert of Europe was a system of dispute resolution adopted by the major conservative powers of Europe to maintain their power, oppose revolutionary movements, weaken the forces of nationalism, and uphold the balance of power.
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Major developments of transportation included toll roads, steam boats, canals railroads, textile mills, and also interchangeable parts.
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