<span>Xiongnu , Buddhism ,Mongols ended song dynasty Trade in general silk road. Underlying these cultural and political achievements was an “economic revolution” that made Song dynasty China “by far the richest, most skilled, and most populous country on earth.” The most obvious sign of China’s prosperity was its rapid growth in population, which jumped from about 50 million or 60 million during the Tang dynasty to 120 million by 1200.</span>
Freed from the danger of a two-front war, the Soviet Union was able to focus all its resources on resisting the German onslaught. ... At the February 1945 Yalta Conference, Stalin agreed that the Soviet Union would enter the war against Japan three months after Germany's surrender
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In May 1895 Justice David J. Brewer delivered the unanimous (9–0) opinion of the court, which rejected Darrow's argument and upheld the government's use of the injunction against the strike (see In re Debs).
In the United States the governments makes collusion illegal with antitrust laws because monopolies reduce economic efficiency.