Which events during the 19th century pull the nation apart and which help keep it together

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

Along narrative poem about the heroic figure is

When conducting research for forming a hypothesis, which practice should historians follow?