Answer:
The cotton gin changed the face of the south. The cotton gin made growing long stable cotton even more profitable. More importantly the cotton gin made growing cotton profitable throughout the south. ... The cotton gin changed the economics of the south and increased the dependence of the south on slavery.
When it fell most people lost trading routes and trading partners since Rome was a big city and everybody went there to trade
Lincoln meant that the country can't survive with half slavery and the other half without it. They have to come together as one nation.
