Cars.
Radio.
Television.
More advanced cars
Mobile phones
There´ s no correct percentage for 2013 yet but in 2012 it came up to 100 works at one percentage
If you are talking about WW2, then Germany (due to British nightly bombings). And if you are talking about WW1, the France as it was where the stalemate in the Western front occurred
James Madison was the president
