Top 3 Car manufacturers by sales in US, 2012:
GM
Ford
Chrysler
EDIT:
Chrysler slipped, or they were forecast to slip in December 2013, below Toyota:
FIAT gets a foothold in the North American market.
They want to, and need to cut their losses in Europe.
This may be a good thing for them.
The Italian Job on the smallest of the Detroit 3
