Germany retaliated by using its submarines to destroy neutral ships that were supplying the Allies.
Because the Hebrews were vulnerable
They created taxes on the people so they had the money to purchase guns and weapons. But they recruited men from the cities and they took them from there families and forced them to fight in the wars.
The Cotton Gin because cotton was being made at a faster pace, and the need for more cotton arose, which also called for the need for more slaves.