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The correct answer of this question is option A. The dark side revealed by Manifest Destiny is the American imperialism. It is the belief that American settles are destined to expand across North America. This resulted to displacement of Native Americans and war with Mexico.
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It was the nineteenth amendment, it made equal voting rights for men and women
The Mexican society wasn't united, since they were constantly fighting with each other. Since soldiers were killed, they also lost military power. When the Spanish arrived, they had a strong military, but also diseases, which killed Mexican soldiers. That made the home society vulnerable.
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