In 1854, the Missouri Compromise was repealed by the Kansas-Nebraska Act. Three years later the Missouri Compromise was declared unconstitutional by the Supreme Court in the Dred Scott decision, which ruled that Congress did not have the authority to prohibit slavery in the territories.
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It was Spain due to that it was controlled by the many Muslim Caliphates but the Reconquista end those 800 years of Muslim population in Spain
I think the Articles had problems with Currency, Interstate Commerce, Foreign Trade, and Foreign Affairs.