The answer is simple - the executives simply don't want to build them.
The Focus isn't an exciting car.  Nobody ever made a name for themselves
in car history by building econoboxes.

Ted

First off I don't believe that to be true.  It is the costs of doing
business in the US, not the build costs that are hurting all American
corporations, not just auto manufactures.

It costs Ford less than $9,000 to build a car, the size of a Focus, that
sells to a dealer for around $13,000.  But it is true, like most every
manufacturer, they need the sales weighted small cars for CAFE to be able to
sell the big cars and trucks that earn the big bucks for the corporation.
The Town Car costs around $19,000 to build and sells to a dealer for around
$37,000

Even if is true Ford needs to do what Toyota does, set up a Japanese
corporation to avoid US Corporate income taxes, get most of their the raw
material and most of the parts made in lower wage counties, that have far
fewer government regulations, then assemble the cars in American plant with
worker who are paid less, get fewer benefits and pay the majority of the
costs for their own health care and pension plans so they can say the cars
are made in America or better yet, simply import most of what they sell in
the US as does Toyota.   ;)

mike

Bloomberg http://doiop.com/hij61l

Toyota Motor Corp. probably moved closer...to ending Ford Motor Co.'s
76-year reign as the second-biggest seller of automobiles in the U.S.

Ford's sales may have dropped in May for a seventh straight month and
Toyota's probably rose, analysts surveyed by Bloomberg said. Through
April, Ford's lead in U.S. sales had narrowed to 50,242 vehicles from
232,922 after the first four months last year.

"I don't think there's much debate that Toyota will overtake Ford" in
the U.S., Dennis Virag, president of Automotive Consulting Group in Ann
Arbor, Michigan, said in an interview. "You won't have to wait very
long for that."

Ford has been No. 2 in the U.S. behind General Motors Corp. since
1931...