Following the american civil war, northern cities saw an increase in population in part to a) an increase in asian immigration. b) soldiers returning home from europe. c) the flight of former slaves from the south. d) the migration of former confederate soldiers. 2) by the end of the reconstruction era, most african-americans in the united states

I took this in USATestPrep, so yeah the answer is C.

d. it adversely affected american productivity

the  seven  days  battles  were  a series of seven battles over seven  days from june 25 to july 1, 1862, near richmond, virginia,  during  the american civil war. the  seven  days ended with mcclellan's army in relative safety next to the james river, having suffered almost 16,000 casualtiesduring  the retreat.