If you are referring to during the time of slavery, up north there was no slavery and they were free. If you are referring to during the civil Rights movement, African Americans faced less discrimination up north and no Jim Crow laws.
Prince Royce
Romeo santos
Anthony santos
According to Yahoos top answer for this exact question, it can be seen from the Pergamon Museum, in Berlin Germany.
ArcheologyTravel.com backs this up. the total of the article is "Babylon to Berlin and beyond: the Ishtar gate in the pergamon museum and around the world" It comments on the "striking reconstruction" of the wall.
Totally would check out the second site for more info!