Planes crashed into the twin towers and killed alot of people
The most important advantage in the north was the industrialization. This was the most important because weapons and other equipment were easier to manufacture.
The most important advantage of the south was that they were fighting on their land, so it was familiar to them. This was the most important because the southerners were in a space that they knew/could navigate better.
The American communist emerged as committed militants within the unemployed movement. And became community leaders in liberal, cultural, and student organizations. They became a major force in several important CIO unions.