This valley is part of the Fertile Crescent.
Brady
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Outbreak of the Spanish American wars of independence in most of the empire was a result of Napoleon's destabilizing actions in Spain and led to the rise of strongmen in the wake of these wars. The defeat of Napoleon at Waterloo in 1815 caused an exodus of French soldiers into Latin America where they joined ranks with the armies of the independence movements.
Explanation:
It decreased due to the fact that many jobs were opening in the urban areas so people left their farms and houses in rural areas to get a job in a bigger city.