The best and most correct answer among the choices provided by your question is the second choice or letter B "The Kansas-Nebraska Act."
The Kansas-Nebraska Act<span> was passed by the U.S. Congress on May 30, 1854. It allowed people in the territories of </span>Kansas<span> and </span>Nebraska<span> to decide for themselves whether or not to allow slavery within their borders. The </span>Act<span> served to repeal the Missouri Compromise of 1820 which prohibited slavery north of latitude 36°30´.</span>
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