What events led to the retreat of the Confederate soldiers?

porter is writing economic history because he is focusing on the cost of developing vaccines.

i dont no the claim so it's hard to answer but i think he would go to the people to decide. : ) ; )

i am not 100   percent sure but i do know that hitler was burned to death with gas so that makes me think it is d. because they were under his control if they fail or not do as told they will be killed but i could be wrong hope this