What impact did the dred scott decision have on congress’s efforts to find compromise and avoid war? what impact did it have on slaves and free blacks?

The Dred Scott decision greatly impeded Congress’s efforts to find compromise and avoid war since it infuriated many people in the North who felt their own personal liberties would be violated, since now blacks who had established a way of life in the free north were no longer immune to the danger and possibility of being caught and re-sold. 

D.successful because there were no legal protections for unions.

"d. the battle of quebec began the french and indian war and the attack on fort duquesne ended it." is your answer this is because the war and attack included washington and his people.