Which continent sold slaves during the Atlantic slave trade

Which of the following was a difficulty faced by the ottoman empire in the 1700s and 1800s?   a.  financial independence      b.  lack of trained artisans      c.  refusal to trade with other nations      d.  rebelling ethnic groups

Which events are correlated but do not necessarily have a causal relationship?

What did nativists think about chinatowns in the late 1800s?