They felt sorta acomplished for doing a part in winning the Civil War. The country was united, and everybody was happy.
1) He was trying to Unite the country, no longer and south, but one country.
2)He abolished Slavery and needed the South to come to terms with this to enforce the laws.
There were many economy reasons for expanding. When you have more land you profit more. There would also more opportunity with more land.
The piece of legislation which created the basic unit of settlement in the territory of north of the Ohio River is the Ordinance of 1785
