Shi Huangdi had the Great Wall of China built to protect the Chinese states and borders against the raids and invasions of the various nomadic groups of the Eurasian Steppe. This included the Mongols to the north, which had been very powerful during the rule of Genghis Khan. The other purposes of the Great Wall were border controls, allowing duties on goods during the period of the Silk Road, regulation and encouragement of trade and the control of immigration and emigration.
Answer:
steam
Explanation:
The cable car, the invention of Andrew Hallidie, was introduced in San Francisco on Sacramento and Clay streets in 1873. The cars were drawn by an endless cable running in a slot between the rails and passing over a steam-driven shaft in the powerhouse.
In 1919 the Treaty of Versailles
50.
According to sources, the number of sovereign states in the half of the 20th century were almost 50. This means that there was an increasing number of states that were acknowledging independence and power -equality among other country.
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