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Rich volcanic soil makes the Po and Tiber river valleys ideally suited for agriculture. Historian Mike Anderson notes that volcanic ash made the soil near Rome some of the best in all of Europe. The surplus also helped Rome to establish trade ties with other Mediterranean powers, enhancing the city's economic might.
Answer:The Declaration of Independence, 1776. By issuing the Declaration of Independence, adopted by the Continental Congress on July 4, 1776, the 13 American colonies severed their political connections to Great Britain.
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