The Erie canal was started in 1817 and was finished in 1825 at a length of 363 miles.
The Nazis and the Soviets had agreed to not engage in fighting because Hitler was focusing on the West, and Russia did not want to get involved. Hitler broke this pact, however, by launching an unprovoked and unexpected attack on Russia through the code name Operation Barbarossa.
So they can govern themselves and do what the people want.
Conflict between the north and south overwhelmed nationalist feelings and led the country to civil war.