All of them were built near a big water source which enabled the people who were living there to survive. The big water source, which was present in any of the mentioned civilizations served multiple roles, among these was a water source for drinking water and a water source for crops which could then be grown.
Hinduism and happiness credit from the utube video; History of the entire world i guess
workers of lowell mills were greatly benefited for the waltham type of work which was more a paternalist kind, trying to protect the integrity of this little girls coming from small farmers and providing an adequate place of work, this in an effort to avoid the issues of bad place conditions and immorality that the people in bigger industrialized cities of great britain were experimenting.
the right answer is the end of world war ii
after the end of a global wwii all the nations involved, in an attempt to create an organization to maintain world peace. this agreement would work settling international disputes via negotiation and arbitration instead of leading the issues escalate to another war.