Was the exchange of people, goods, and ideas from Europe to the New World (and vice versa) worth the cost?

i think the answer is a and i hope this ; ))

the answer is jerusalem

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.