It was determined from chemical analysis and observations by the EPA in the 1970's that the Love Canal in New York is considered to have "contaminated with toxic chemicals." Due to these, the canal was furthermore restricted to any human activities taking place due to the hazards it would produce.
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advances in tool making technology led to advance in agriculture and farming revolutionized the world and set prehistoric humans on a course toward modernity inventions such as the plow helped in planting of seeds. no longer did human have to depend on the luck of the hunt.
I think the civil rights act of 1964
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The Mexican army attacked them. The main cause of the war was the westward expansion of the United States. All through the 19th century Americans believed it was their right to expand westward. At the time they believed they could conquer the people already living on the land and take it for the United States.
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