The Battle of the Wilderness, where many soldiers died of suffocation in the burning forest.
Stones River (Murfreesboro) where the whole battlefield was frozen.
Appomattox, where Lee's men were barefoot, starving and deprived of sleep.
Andersonville Prison
the worst war the USA. fought was the Civil War.
It is necessary to answer this question in a manner that is open to debate as it is all based on conjecture but the likely answer would be the prison conditions in Andersonville prison.
Gunpowder
the battle of antietam
BAD
the cities of the south
Gettysburg
Andersonville
bad
is total war which means they destroy everthing!! and the worst war was the civil war which killed at least total of 500,000 much more then all the wars combine!!
conditions required for a investment climate after civil war