Answer:
Gays and lesbians could not be fired from their job.
Explanation:
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Because the US was the first to successfully develop an atomic bomb
Brown v. Board of Education was a landmark case in which it was finally proven that segregation in institutions of education was highly unconstitutional, so you could say that that is the greatest effect since it made other schools become open for everyone as well.
The doctrine that allowed people living in the territories to decide the issue of slavery through their governmental bodies was called popular sovereignty.