Four elements influenced the shapes of the states: the American Revolution, the 1808 proposal for the Erie Canal, railroads and slavery. http://www.loc.gov/loc/lcib/0809/states.html
There is no such thing. Although 4 of the 50 states (Massachusetts, Pennsylvania, Kentucky and Virginia) are known as Commonwealths. They are still states. The United States has 50 states, 5...