How cars have changed the world

Sub Questions:
-What kind of break throughs has there been?
-how have they advanced over time?
-how do cars affect families financially?*
-How the dangers and safety of cars affect families?
-How do they help the governement?
-How do cars affect the economy and wild life?
- How do cars help our troops, police, fire fighters, paramedics, ect?

What I already know about Cars and how they affect the world:
-There are 99 brands of cars in the world
-The first car ever made with a ignition key and a stick shift was a 1932 Cadillac
-the first gasoline car was made in 1898
-Best selling vehicle is a Ford F-150
-The most expensive new street legal car right now is a Bugatti Veyron 16.4 SS. $2,500,000
-The Acura RL is the worst selling car. selling just over 1,000 in 2011 to Fords F-150 at 180,000 units