HELP HELP Why did the population of U. S. cities drastically increase from 1840-1870? * The rise of industrialism in the United States
The establishment of a federal income tax
A prolonged food shortage in the United States
A lengthy war over disputed territory

It may be written down (as in the united states) or it may be unwritten (as in great britain). this is the 1787 meeting at which the  constitution of the united states  was debated and agreed upon. this was a 1787 meeting called by congress to amend the articles of the confederation.