Answer:
The most convincing 'internal' factor behind southern defeat was the very institution that prompted secession: slavery. Enslaved people fled to join the Union army, depriving the South of labor and strengthening the North by more than 100,000 soldiers. Even so, slavery was not in itself the cause of defeat.
Explanation:
Before the Civil War, most people in the North worked in factories.
False, because it was more closely associated with the spreading of cultures in Africa.
Answer:
a competition between nations for superiority in the development and accumulation of weapons, especially between the US and the former Soviet Union during the Cold War.