1) Oil prices and economic inefficiency.
Yamani, declared that Saudi Arabia was quitting the agreement on oil production restraint, and started to boost its share in the oil market. After this, Saudi Arabia increased oil production by 5.5 fold, and oil prices dropped by 6.1 fold,
2) ethnic tensions
3) Gorbachev’s reforms
In 1609, two years after English settlers established the colony of Jamestown in Virginia, the Dutch East India Company hired English sailor Henry Hudson to find a northeast passage to India. After unsuccessfully searching for a route above Norway, Hudson turned his ship west and sailed across the Atlantic. Hudson hoped to discover a "northwest passage," that would allow a ship to cross the entirety of the North American continent and gain access to the Pacific Ocean, and from there, India. After arriving off the coast of Cape Cod, Hudson eventually sailed into the mouth of a large river, today called the Hudson River. Making his way as far as present-day Albany before the river became too shallow for his ship to continue north, Hudson returned to Europe and claimed the entire Hudson River Valley for his Dutch employers.
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Britain retained control of the region after World War II, when it became a United Nations trust territory. Tanganyika gained independence on Dec. 9, 1961, and became a republic one year later. On April 26, 1964, it joined with Zanzibar to form the United Republic of Tanganyika and Zanzibar.
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Battle of Marathon, (September 490 bce), in the Greco-Persian Wars, decisive battle fought on the Marathon plain of northeastern Attica in which the Athenians, in a single afternoon, repulsed the first Persian invasion of Greece.
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