Option C: Missouri courts had set other slaves free after they’d lived in free states.
<u>Explanation</u>:
“Dred Scott” had filed a 'freedom suit' in “St. Louis Circuit Court” in 1846 after he was not able to achieve freedom. Missouri precedent, in 1824, said that slaves who have been freed in a free state because of being prolonged residents, would remain free when returned back to “Missouri”. The doctrine was known as "Once free, always free". This means that if the slave got 'freedom' in a free state, then that freedom could be approved by the court after the person returns to a slave state.
Then in 1865, an ordinance was approved which had put an end to slavery in Missouri.
<h3>Plessy v. Ferguson was a landmark 1896 U.S. Supreme Court decision that upheld the constitutionality of racial segregation under the “separate but equal” doctrine.</h3>
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The Zhou Dynasty was proceded by the Warring States Period (when many states were fighting for dominance, won by the Qin). Confucianism was created by Confucius to try to find the cause of war and to prevent it. I hope this helps! Have a great rest of your day!