The U.S had a democratic system, but Britain had a dynastic system.
Total warfare was when a country used any or all resources available for war and infrastructure as a ligament military target. This war far cause significant civilian or other non-combat deaths.They required this warfare because this would make it easier to win the war and also some never gave up with this type of war.
Both theodore roosevelt and woodrow wilson influenced franklin roosavelt's NEW deal ideas.