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In an effort to preserve the balance of power in Congress between slave and free states, the Missouri Compromise was passed in 1820 admitting Missouri as a slave state and Maine as a free state.
The answer is B hope it helps
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<u>The Serbian people had a long and rich history but, like Germany and Italy, they did not become an independent nation until the late 19th century. ... Serbia became a self-governing principality in 1830 and an independent and internationally recognised nation-state in 1878.</u>
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<u>(I hope this helps! :)</u>
The reason why the Marshall court is considered so central to the nations history is because it was practically the first major Supreme Court in the US--meaning that it set many legal and structural precedents for future courts.