The Battle of Britain was the first major campaign to be fought entirely by air forces, and was also the largest and most sustained aerial bombing campaign to that date. The Battle of Britain marked the first defeat of Hitler's military forces.
During the industrialization of the North during the 1850s, the North progressed much faster than the South, where cotton and agricultural crops were cultivated.
While industrial production in the North has grown, in the South, African-Americans remained slaves.
This has resulted in large divisions within the United States.
