What caused the battle of antietam to be the single bloodiest day in american history? a) confederate troops unexpectedly used guerilla tactics b) confederate troops out numbered union troops 2 to 1 c) troops march forward in close formation against newer, more accurate weapons d) a meeting of the largest armies ever in one place

i believe your answer is d)

the foundation of greek city-states: following the fall of the mycenaean civilization in the 10th century bc, the area surrounding the empire went through its own mini dark ages. answer and explanation

australian plates collided into eurasian plates, and the himalayas formed. the andes mountain range the himalayas and the islands of japan form differently. the andes mountain range formed at the convergent boundary of an oceanic plate and continental plate.