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Hydraulic mining developed from ancient Roman techniques that used water to excavate soft underground deposits. Its modern form, using pressurized water jets produced by a nozzle called a "monitor", came about in the 1850s during the California Gold Rush in the United States.
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military and defense advancement
Explanation:
The Cold War began after the Second World War when tension between Eastern and Western Europe rises. The anxiety began because of different political ideas as Eastern Europe followed communism and the Western as Democracy. The Cold War created a sense of tension and fear. The arms race started within two nations, which led to the Cold War. Both countries, the Soviet and the United States, spent billions of capital trying to make nuclear weapons to display their strength.
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Spanish settlements in North America had one purpose only: to protect their shipments of gold and silver from competing European powers. The first successful settlement in North America, St. Augustine, Florida was built to protect Spanish fleets from attack by privateers. The statement above that the Spanish had "big cities. large farms" is patently incorrect.
It should be noted that the first successful rebellion in America; Pope's rebellion, also known as the Pueblo revolt, was the result of numerous failed promises on the part of the Spanish. Four hundred Spaniards were killed in the revolt and the Spanish lost control of New Mexico.
