Touissaint L'Ouverture is most closely associated with leading the revolution in Haiti against the French, and helping Haiti win their independence.
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James B. Weaver, of the Populist party. Although he only won five, not six.
He did get one faithless elector from Oregon, so they might be counting that.
ANSWER: Indus Valley
Many historians believe the Indus civilization collapsed because of changes to the geography, climate of the area, halted trade with Mesopotamia, and Aryan invasions.
President Adams did have a successful career after his presidency, and I think it was even more successful than presidency. His retirement from office was quite productive, because after becoming the second President, he became the first Vice President of the United States.