Answer:
#3: Recent economic downturns have resulted in a decline in urban living
the confederacy lacked soldiers compared to the union and lacked factories to produce weapons, etc
Trade is when two or more people exchange items such as food , money , books and etc...
When our country = America ( USA ) trades goods such as money , or food and medical supplies to other countries ( Nations ) to help them and in return we might get more supporters or better Technology.
I really hope that this helps you out a lot.
