Ever since interchangeable parts came about with the industrial evolution it became a lot easier to mass produce something and to then fix it. Ford was known for inventing the assembly line. This made it easier to manufacture cars.
This also allowed mechanics to work on all cars, they would just need to order the parts. People in America need cars to get almost anywhere, unless you live in a bigger city.
I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.