To keep information a secret, So they tell limited amount of people.
It was a recruitment poster for African American men to join the Union Army...
I know which question you're on so it will be the option that says "defeat the Confederacy in the Civil War"
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A form of discrimination that is upheld by the law is called legal discrimination.
De facto segregation refers to segregation that occurred by fact, as opposed to by law. Jim Crow laws refer to laws upheld slavery, and segregated and discriminated against those who would later become African Americans.