World War II forced Americans to confront the fact that African-Americans were dying for the United States in battle but when they came home, they were subjected to horrific discrimination.
Congress had decided that once a slave traveled into a free state, they were free and they could never be enslaved again. But in the Dred Scott decision, they changed their mind and people no longer had to honor "once free, always free."
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mongols were engineers they developed taxes also as they expanded there empire
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