Would it be Jim Crow Laws? The Court found nothing unconstitutional about what happened and nothing was truly done about the Segregation until Brown vs. Board of Education 1752-1754.
The act was about ensuring people have voting rights and preventing states from preventing voting rights in various ways such as having literacy tests or voting taxes or anything similar. One effect can be that it enabled for all people to vote regardless of color or origin, and another is that it enabled minorities and immigrants to vote too because it enabled minorities who didn't know English that well to vote using bilingual ballots.
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Human Interaction is the major causes of deforestation.
