In 1800, there were 5,308,483 people living in the Northeast. In 2000, there were 281,421,906 people. The answer is 2000.
The Dred Scott Supreme Court case ruled that slaves are property and are allowed in all states/territories, even if slavery is outlawed in the state constitution.
This idea supports the concept of nullification, as states that abolished slavery would nullify (refuse) to follow this ruling because they felt it was unconstitutional.
This idea also limited the power of the federal government to restrict the expansion of slavery because the court ruled that slaves do not have legal rights and are considered property no matter where they go. This meant that slavery can essentially exist anywhere in the US and the federal government couldn't change that unless they made a national law/amendment that outlawed slavery.
I am sorry. I don't have that book but ill try my best. They consider it a more modern war because of the time. It is also because of several modernized inventions. For example, some cars, the cotton gin, and steam boats. People were escaping slavery and fighting for rights. There was also tons of new cultures coming from other people.