The historian in the passage is most clearly demonstrating which historical thinking skill
'a historian reviews several of his colleagues' books about early african states. he then writes his own book summarizing the findings in these works and offering his own opinions on their significance.'

a

explanation:

an economic reason that the south needed a reconstruction plan is that plantations, factories, and other businesses were destroyed during the war.

b. martin luther king jr. wrote and spoke "i have a dream"

explanation:

i know this 100 percent is correct   b. is the best one. < 3

in 1862, president lincoln's emancipation proclamation opened the door for african americans to enlist in the union army. although many had wanted to join the war effort earlier, they were prohibited from enlisting by a federal law dating back to 1792.

explanation: