Nickname comes from his mentor, Andrew Jackson, who was called Old Hickory. Polk entered Congress in 1824, when Jackson won the popular, but not the electoral vote to John Quincy Adams. When Jackson won both, in 1828, Polk became his protege.
Answer:
Africans were in turn brought to the regions depicted in blue, in what became known as the "Middle Passage". Enslaved Africans were then traded for raw materials, which were returned to Europe to complete the "Triangular Trade".
Jews were forced to move from their homes to basically what we would call slums, but they were called "ghettos", which is where we get the slang term.
