Name and briefly explain the three primary causes of the enormous population growth in the United States between the years 1860 and 1910.

panamal canal treaty and iran hostage crisis hope this

i need the diagram.

for hobos it was a very hard time most hid on the sides of the railroad tracks causing people to get bulls and get them off sometimes causing in fatal death they couldnt get people to give them money because the   people were also in need of money